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Erin Killeen
Erin Killeen

BUILT IN SIX

with Erin Killeen

97% User Satisfaction Score

Solin Guarantee

This program is 100% Money Back Guaranteed. If you are unsatisfied at any time within 30 days of purchase, Solin will refund your money.

Your Access Includes

  • ✔️ 6-Week Program // Build lean muscle, lose fat, create a consistent routine, and rediscover your confidence by pushing yourself to new limits
  • ✔️ Gym & Home Versions with video demos & in-app tracking – everything you need to achieve your goals!
  • ✔️ One-time purchase for lifetime access (you can start & repeat the program at any time)

From Erin

Transformations

user tranformation testimonial
Kristi

"1st Place in Be Legendary 2023 Challenge"

user tranformation testimonial
Kryssy

"1st Place in Be Legendary SHRED Challenge"

user tranformation testimonial
Ali

"1st Place in Be Legendary Spring Challenge"

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Solin Guarantee

This program is 100% Money Back Guaranteed. If you are unsatisfied at any time within 30 days of purchase, Solin will refund your money.

Program Highlights

program highlights from creator

From Erin

Erin

This is where your fitness goals become reality, and your transformation story begins! This 6-week program isn’t just about workouts – it’s about committing to your health, pushing your limits, and becoming the strongest version of yourself.

Why Choose BUILT IN SIX?
This program is designed to help you build lean muscle, lose fat, and create a consistent routine. Whether you're just starting your fitness journey or are a seasoned athlete, it’s your chance to commit, grow, and unlock your full potential.

With expert guidance, structured workouts, and every resource you need, the guesswork is gone – leaving you free to focus on achieving your goals.

What You Can Expect:

  • 5 Challenging Workouts Per Week:

    • Glute-Focused Legs

    • Shoulders/Chest/Triceps

    • Quad-Focused Legs

    • Back/Biceps

    • Full Body

  • Extensive Exercise Video Library: Perfect your form and technique.

  • Gym & At-Home Options: Flexible for any setup. You receive access to both versions with purchase

  • In-App Tracking: Track weights, reps, and progress easily.

  • Lifetime Access: Repeat the program as often as you’d like.

Take the leap and discover what you’re truly capable of. Let’s crush this together – welcome to BUILT IN SIX!

Questions? Contact support@solinfitness.com.

This program is open to all fitness levels, worldwide!

Erin's Reviews

97% User Satisfaction Score

137 Reviews

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Kim K.

March 2025

SPRING SHRED – 6 Week Challenge

I have done Erin’s workouts before , I feel they are very challenging and I love the videos

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Shaela R.

March 2025

The 2025 Challenge

This challenge was truly exactly what I needed to become more consistent in the gym and give me the motivation to find a routine I enjoy. I am SO much more comfortable in the gym and had so much fun learning throughout this challenge. Thank you so much Erin!!!

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Rahela S.

March 2025

The 2025 Challenge

VERY HAPPY with the program. If you’re thinking of doing this, DO IT! Very easy, straight forward workouts. From beginner to advanced, it is for you!

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Jordan L.

March 2025

The 2025 Challenge

Absolutely LOVED this challenge!! I would have liked to see more focus on calves though!

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kristen m.

March 2025

The 2025 Challenge

This was hands down the best fitness challenge to be apart of. From the workout plan & app design to the facebook community & direct help from erin & fran, im signing up for every challenge available in 2025 to continue falling back in love with fitness. I felt like I was in a pattern of stopping & starting again but this challenge re-lit a fire inside to keep pushing. 💪🏽

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JenniferL. D.

March 2025

The 2025 Challenge

It’s been a year full of Erin’s Challenges! I’m so glad I stopped watching from the sidelines. Stop overthinking it and just START! The workouts, the ease of use on the app and online community are unmatched. This is your sign - listen! You won’t regret it!

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Ashley J.

March 2025

The 2025 Challenge

This was my first challenge & it won't be my last! Erin does a great job w/ her content each week. As a beginner in the gym I appreciated her videos of each exercise to ensure l was doing it with correct form. I was able to get in and out of the gym quicker by having her workout plan (reps and sets) right on my phone. The community definitely helped keep me consistent and I feel like I have now developed the discipline of a daily routine in the gym. Overall 10/10. If you are on the fence, definitely go for it. You won't regret it!

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Casey C.

March 2025

The 2025 Challenge

This challenge was awesome! The group engagement really helped hold yourself accountable as well as feeling like you’re going through it with others not just on your own.

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Samantha N.

January 2025

The 2025 Challenge

These challenges are amazing! They are a great split between workouts and are easy to follow! The community in Solin is empowering and a great place for accountability!

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Candace B.

December 2024

Winter Arc Challenge

I loved this challenge. I haven't worked out in a couple of years and saw dramatic improvements to my body in just 4weeks, I was shocked. The support of the community was great as well. I'm looking forward to my next challenge!

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Taylor T.

December 2024

Winter Arc Challenge

I loved the program & accountability. I loved the app. The whole experience was great and I can’t wait for the 2025 challenge! Huge thanks to Erin & SOLIN!

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Tina I.

December 2024

Winter Arc Challenge

I absolutely loved this challenge! It help keep me on track and I love how it showed the progress I was making. I also loved the videos of each exercise . I would watch a video before a I would start the next workout to help make sure I was using proper form . The last thing I loved about this was the community. The community was so uplifting and I loved the cheering of each other on. I really excited for the next challenge and can’t wait to get started on it!

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Mattie H.

December 2024

Winter Arc Challenge

THIS PROGRAM/ APP WOWOWOWOW. Everything was so organized and clearcut, it made it that much easier to just go in and get the work done. This is a new lifestyle that I don’t ever plan on letting go of. I cannot wait to see how much more muscle I can put on and how toned I can get through this app. I wish yall could actually feel my gratitude over here. This program helped me show up, and that’s exactly what I needed!

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Rachel C.

December 2024

Winter Arc Challenge

A great challenge to keep me focused and accountable during the hardest season of the year.. holiday season! Erin’s challenges come with a punch and will work muscles you never knew you had. Great community, great challenge, great leader!

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Rachel C.

December 2024

Winter Arc Challenge

I love Erin’s programs so much. This challenge is perfect to keep you on track during the toughest time of the year… holiday season. The support from Erin and the community within the challenges is unmatched! Would highly recommend this program for anyone wanting to try out Erin’s challenges & keep yourself in check through the holiday season!

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Nancy C.

November 2024

The Grind – 6 Week Challenge

Awesome first challenge with Erin and certainly not the last!

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Hannah M.

November 2024

The Grind – 6 Week Challenge

Erin creates the best challenges every time. They just keep getting better. This is my second challenge of hers and I won’t stop. I recommend them to everyone. Great workouts and a great community!

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Tayler R.

November 2024

The Grind – 6 Week Challenge

everything about this program was 👩🏻‍🍳💋! from the workout splits every week to the videos showing how to do the workouts. i was actually sore after every workout! i am so happy i found this, its helped me so much stay on track and be excited for the next day to hit the gym! can’t wait for the next one! 💪🏻

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Christy D.

November 2024

The Grind – 6 Week Challenge

This was my second challenge with Erin. I have tried so many others and Erin’s challenges are the only ones that I feel really give you the progress you’re looking for. Each of the workouts are curated perfectly! The access to the community for support and motivation is also a huge component that I enjoy. The past 6 weeks were challenging but also so rewarding and I will keep doing challenges with Erin as long as she keeps doing them!

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Courtney B.

November 2024

The Grind – 6 Week Challenge

I loved how simple this whole process was. Normally when starting a new program, it’s easy to give up in the beginning due to them being confusing and very overwhelming. This made me feel at ease and very motivated. I wasn’t thrown too much information or overflown with unnecessary information. The workouts were very strict and easy to understand. The videos added to it make it easy to figure out, even without weights. I loved that Erin would comment back on things in the community. It made me feel like she was really there to help and not just make money off of the program. It was really appreciated, even when we knew she was really having life thrown at her. ❤️

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Erin J.

November 2024

The Grind – 6 Week Challenge

I love Erin’s challenges. They are motivating, challenging and the community is like none other. I have done 4 challenges now and will continue to do more. The best of the best !!!

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Melissa P.

November 2024

The Grind – 6 Week Challenge

I loved this challenge!! The workouts were challenging and the best part for me is that they were no longer than 60 minutes a day. This program definitely helped me jump start my fitness journey and the community was very supportive. I look forward to the next challenge to keep me on track!!

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Amanda C.

November 2024

The Grind – 6 Week Challenge

I liked how you can track your weight and keep count of your reps.

CS

Caitlyn S.

November 2024

The Grind – 6 Week Challenge

This program challenged me and allowed me to become more consistent with working out. My strength definitely increased. Having a community working towards the same goal definitely helped.

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Abigail M.

November 2024

The Grind – 6 Week Challenge

I really liked this program I have felt so much strength being build and hope that if I keep going I will see some fat melt as well.

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Rachel C.

November 2024

The Grind – 6 Week Challenge

I love Erin’s challenges, but this one lit me up! Her challenges hit all the places you didn’t even know could be sore! I’ve seen fantastic results from her 8 week challenges, but this 6 week challenge has really pushed me!! If you’re looking for a program to follow to kick your ass in a good way, this is it!!! You will see so much progress mentally and physically. The community within her challenges are AMAZING SUPPORT.

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Lanae S.

October 2024

The Grind – 6 Week Challenge

Great program! Switched up after three weeks to keep it interesting. I love her workouts and they are very challenging.

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Stephanie K.

October 2024

The Grind – 6 Week Challenge

This app is so user friendly and easy to navigate. It came as part of a fitness challenge and after using other fitness apps, this is at the top.

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Barbara B.

October 2024

The Grind – 6 Week Challenge

The app works great and I'm actually verysore from this first week of workouts !!!

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Hannah W.

October 2024

The Grind – 6 Week Challenge

I really like the videos of the movements. I also like that the app keeps track of how much you lifted and gives you fun comparisons to what you lifted!

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Sarah h.

October 2024

The Grind – 6 Week Challenge

Erin’s programming is the perfect amount of hard and she has the best community. I am really impressed with how present she is with her challengers whether it be with answering questions or giving support.

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Oscar F.

October 2024

The Grind – 6 Week Challenge

I’m loving the experience, definitely powerful & hyper focused movements from this program! — I’m static to see what these next few weeks will be like, but getting started was the best steps I’ve taken & trusting Erin w/ my new routine!!✅

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Becks N.

September 2024

Be Legendary ELEVATE

Fantastic programming! Easy to follow, easy to progress, options for all fitness levels, and SO fun! I saw a ton of progress and absolutely got stronger. Loved every workout!

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Randi R.

September 2024

Be Legendary ELEVATE

I absolutely loved this challenge. I’ve done several others using different trainers programs, but Erin’s is by far my favorite! Just bought the Grind 6 week challenge and I can’t wait to start it.

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Ash L.

September 2024

Be Legendary ELEVATE

I loved the program! The only thing that would be really cool is if it had the built-in timer like some of your old challenges had. I realize those were on another platform, but if we could get that back, that would be awesome!

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Courtney M.

September 2024

Be Legendary ELEVATE

This was my first challenge and I was so pleasantly surprised by the quality of the home workouts. My ONLY recommendation to make it better would be to pair the home with gym exercises so if we have a barbell, squat rack, or whatever is needed for gym version we could sub them in. For example if goblet squat is a front squat in gym version, note that so if I have squat rack I could do front squat versus goblet (more weight available to load on BB versus limited DB weights). This probably wouldn't affect many, but I would love to see it personally. I am so grateful to have rediscovered my love for lifting weights thru this challenge, and have already signed up for the next!

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Ellen s.

September 2024

Be Legendary ELEVATE

I’ve been with Erin since August of 2023 and absolutely love every challenge. This challenge really helped me stay accountable during a struggling time!!

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Astra G.

September 2024

Be Legendary ELEVATE

This was my 4th challenge I’ve done of Erin’s and I can’t express enough how much she is a programming genius! As a new personal trainer myself, even having the knowledge there is just something about her programs that I prefer for myself than writing my own. I am not afraid to learn from the BEST!!!!! I was in such a funk with the overwhelming load of life and school but this challenge put me right back into the mindset I need to be in to kick ass all around! I am so looking forward to the next challenge and once again I CAN NOT EXPRESS just how thankful I am!

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Allyson V.

September 2024

Be Legendary ELEVATE

I loved how this program challenged me. I don’t feel like I made much progress but that’s my own fault. Can’t wait to try again soon!

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Alyssa A.

September 2024

Be Legendary ELEVATE

These challenges have changed my life. I’ve seen so many changes within myself and others! It’s an amazing community❤️

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Baylee D.

September 2024

Be Legendary ELEVATE

This is my second challenge with Erin and I’ve loved both! All the workouts are great and easily modifiable to make them easier or harder depending on skill level. I’ll be back for number 3!

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Courtney S.

September 2024

Be Legendary ELEVATE

Amazing program. Challenging but so rewarding. The community and facebook group is so positive and supportive. Will be doing another challenge

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Brittney S.

August 2024

Be Legendary ELEVATE

This program is perfect for me. The app is easy to navigate and it has at home workouts which I love

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Genevievehudon d.

August 2024

Be Legendary SUMMER

J'aime que que l'option du programme à la maison soit aussi satisfaisant que celui au gym. Je trouve ses programmes toujours diversifiés et complets. Je recommande ++++

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Simmi K.

July 2024

Be Legendary SUMMER

The program was great. I feel soo much stronger and can feel difference when i go to spin classes or a run . Ive gained soo much strenght thnk u

JF

Jessica F.

July 2024

Be Legendary SUMMER

I chose to do this program to challenge myself. I wanted to fully see what I could do if I pushed myself. I had days of struggle throughout the 8 weeks, but I never gave up. This program challenged me not only physically but mentally and emotionally as well. I’m grateful for this program and the community behind it that was supportive and uplifting. I’m excited to see how my journey continues and future challenges!

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Jessi M.

July 2024

Be Legendary SUMMER

I’ve followed Erin for years and she’s always been a huge inspiration to me so i decided to purchase one of her challenges. I’ve always been inconsistent in the gym so I have some knowledge but not all this program offers videos showing you what you should look like doing an exercise plus a group of wonderful women to help talk you through the challenge as well. The workouts are well structured and if you follow them i promise you will see changes in yourself and your body!

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Kayla N.

July 2024

Be Legendary SUMMER

I loved the option for home and gym workouts. Having the instruction video for every movement was incredibly helpful! I loved it. Absolutely will be doing it again!

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Shannon C.

July 2024

Be Legendary SUMMER

I was getting bored of the same routine and knew I wasn’t producing results the way I wanted too on my own. This program helped me produce results in 8 weeks that took a year or more for me in the past. So grateful for Erin and the community she created here 🫶🏼

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Lindsay J.

July 2024

Be Legendary SUMMER

The program was challenging, flexible, and having access to the community of people supporting you and lifting you up every day is a game changer. I’ve seen so much growth in myself over the last 8 weeks, especially mental growth!! Would recommend this program to anyone wanting to enhance their performance and their mental discipline!

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Transformations

program transformation testimonial image from Kristi
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1st Place in Be Legendary 2023 Challenge

Kristi
program transformation testimonial image from Kryssy
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1st Place in Be Legendary SHRED Challenge

Kryssy
program transformation testimonial image from Ali
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1st Place in Be Legendary Spring Challenge

Ali
program transformation testimonial image from Victoria
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2nd Place in Be Legendary 2023 Challenge

Victoria
program transformation testimonial image from Taylor
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2nd Place in Be Legendary SHRED Challenge

Taylor
program transformation testimonial image from Jolee
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2nd Place in Be Legendary Spring Challenge

Jolee
program transformation testimonial image from Kelsey
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3rd Place in Be Legendary 2023 Challenge

Kelsey
program transformation testimonial image from Amanda
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3rd Place in Be Legendary SHRED Challenge

Amanda
program transformation testimonial image from Taylor
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3rd Place in Be Legendary Spring Challenge

Taylor
program transformation testimonial image from
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My Transformation

Erin Killeen

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128.1K views

Trending on Solin

Top 5% Creator

In 2017, I began my fitness journey and lost 70 pounds, completely transforming my life in the process. What started as a personal mission to feel better and healthier grew into a passion for the gym and a drive to help others achieve their goals. Over the years, I’ve had the privilege of helping thousands of people transform their bodies and minds. Now, I’m bringing that same expertise to you with programs designed to help you crush your goals—whether it’s losing fat, building muscle, or simply falling in love with fitness. Let’s make your transformation happen. Your journey starts here.

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