"3 weeks into your program...I'm already 8 lbs down and feel my explosiveness coming back!" 

Hitting the Gym, Sprinting, and Eating Right Won’t Get You Bigger, Faster, or Stronger

Unless you follow a plan tailored to you. Scroll to find out how thousands of athletes are following custom training programs without the heavy price tag.

Dear Athlete,

Do you feel like you’re working hard but not seeing the results you want?

Are you confused by conflicting advice on the best way to train?

Have you ever been sidelined by an injury and worried about falling behind?

If you answered yes to any of these questions, then I've got some excellent news for you.

My name is Gerry DeFilippo, and I am the founder of Challenger Strength. Over the past 8 years, my staff & I have overseen the development and training of over 150+ college and pro athletes across 61 (and counting) collegiate programs and professional organizations.

At Challenger Strength, we see athletes from all walks of life:

-High school athletes aiming for college scholarships
-College players looking to go pro
-Youth athletes just starting their journey
-Coaches seeking to improve their team’s performance

As you can imagine, I've seen it all, and after working with so many athletes, I've come away with one big lesson:

No Two Athletes Are the Same.

So when I decided to create an online workout system, personalization was my main focus.

The problem with other programs is they force everyone into a one-size-fits-all system.

Let's say you have an athlete with very flexible joints. If they followed a stretching routine that's too intense (like many experts suggest), they could easily hurt themselves. On the other hand, someone with very stiff muscles might do those same stretches and finally get relief from their back pain.

Now, imagine a situation where these athletes are lifting heavy weights and moving as fast as they can. Think about how seriously one of those athletes could get injured. It could be bad enough to end their career.

Which brings me to my point: why do people still buy cookie-cutter programs?

I asked every single athlete I trained this question for a month, and the two biggest reasons were:

1. High-quality customized programs are usually very expensive.
2. There are only a few coaches who can deliver such high quality programs.


Hearing this feedback sparked something within me.

I knew I had to find a way to deliver the personalized plans athletes needed…and I needed to make it affordable for everyone.

But I also couldn’t take the time to evaluate and craft a program for each athlete, so I kept thinking.

Finally, it hit me:

I train hundreds, maybe thousands, of athletes every year at my facility.

Through that process, I’ve created countless workout programs for every situation imaginable.

I thought to myself…

"What if I could give athletes access to all of those programs programs and show them how to pick the right one on their own?"

That way, they could get the personalized plan they need without paying hundreds every month to get it.

So that’s exactly what I did.

I took every drill, program, and exercise that created results for my athletes in the facility, and I added them all onto a mobile app you can access from anywhere in the world.

It’s called the OnlyStrength App.

Unlike typical programs, OnlyStrength offers a variety of workout routines you can choose from based on how you move, your schedule, and your goals.

It’s not just a couple of random workout programs thrown together. It’s an ecosystem of quality workout programs for any goal, age, sport, and level. It includes video tutorials, exercise modifications, and more.

Most importantly, it’s affordable. Access to this system costs less than a large pizza.

​Here’s everything you need to know about it:​

"I began training with Gerry and Challenger Strength in 2016 as a youth hockey player. The consistent training and guidance helped me develop the size, speed and physicality to become a Division 1 hockey player. Every athlete should be taking advantage of OnlyStrength."

Dean Toskos
Holy Cross Hockey '28

I've been working with Gerry and Challenger Strength since I was 12. Gerry has taken me from a little, scrawny un-athletic kid to a D1 athlete. If you're not taking advantage of OnlyStrength so they can help YOU as well, what are you even doing?"

Jesse Bash
Stony Brook Baseball '28

"I have worked with Gerry since I was in 8th grade and he has helped guide me all the way to Division 1 football. OnlyStrength will give thousands of athletes around the world access to the same training that helped me build 4.4 second 40 yard dash speed!"

Charles DePrima
Harvard Football '26

Unlock Your Competitive Edge With Proven Training Programs, Diet Plans, & Daily Access to an Expert Who's Trained Thousands of Athletes Like You

Go From Getting Overpowered...

...To Overpowering Your Opponents.

Inside OnlyStrength, you will have access to:

  • Your Entire Year of Performance Training Programs: Off-season, in-season AND youth programs provided and updated year-round, 4 day per-day offseason training programs, 2-3 day per week in-season training programs. Every sets, rep, load, and progression prescribed for you to follow. Regressions to adapt when needed.
  • Custom built workout programs for different goals like: Strength, speed & agility, power, jumps, plyometrics, warm ups, and movement work.
  • 750+ (and counting) exercise demo videos available in our app. Complete with instructions and cues to help you perform programming correctly, safely and effectively.
  • A members community inside our app where you can get direct access to me. I will answer all your questions and help you as needed every step of the way.
  • Weekly live Q&A sessions to ask me anything you need directly. All recordings are shared with the group.
  • Monthly guest masterclasses from the top performance and sports coaches in the field. Each masterclass covers specific topics in performance and speed training so you can learn from other experts in the world of performance
  • Weekly written and audio learning curriculum to dive into the “why” behind our training so you can learn and understand it (and better apply it come gametime)

If I were to train you 4 times per week in person all year, it would cost over $10,000.

But you won’t pay that.

As an OnlyStrength member you’ll be getting the same quality programming, with the same direct support from me, with the added convenience to do it whenever you want for a fraction of that price:

Just $19.99 per month or $199.99 for the entire year. The choice is yours.

An absolute steal of a price according to our members. And it won't stay there for long.

But you don't even need to commit 100% right now. Just say "Maybe" for now, and re-evaluate in 30 days from now.

After all, you're protected by our money-back guarantee so you can test this system for yourself risk-free.

Slow & Steady

Month to Month

$19.99/mo

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Everything You Get Access To:

  • Dozens of pre-built training programs for every time of the year
  • Programming to fit any goal like speed, strength, explosiveness, etc
  • 750+ (and counting) exercise demo videos
  • A mobile app with an online community for support
  • Weekly live Q&A sessions to ask me anything you need directly
  • Monthly guest masterclasses from the top performance and sports coaches
  • Weekly written & audio learning curriculum to dive into the “why” behind the training

All In

Annual

$199.99/yr

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Everything You Get Access To:

  • Dozens of pre-built training programs for every time of the year
  • Programming to fit any goal like speed, strength, explosiveness, etc
  • 750+ (and counting) exercise demo videos
  • A mobile app with an online community for support
  • Weekly live Q&A sessions to ask me anything you need directly
  • Monthly guest masterclasses from the top performance and sports coaches
  • Weekly written & audio learning curriculum to dive into the “why” behind the training

WHAT PEOPLE ARE SAYING

Why Join OnlyStrength?

"...Keep pushing our field forward!"

"“Gerry, it’s easy to see you have amazing passion for this field and authentic care for the athletes you coach. Love your work and we should try and catch up/ visit in our off-season. Keep pushing our field forward!!!”

- Brad DeWeese, Director of High Performance, New York Jets

"I recently had the best broad jump at a college football camp."

“I’ve seen huge improvements in my maximal strength, which is greatly shown in my acceleration on the field and I recently had the best broad jump at a college football camp. I love OnlyStrength because Gerry lays out a full plan and I don't have to guess or worry about what I'm going to be doing in the gym or at the field.”

- Jalen Morales,Wide Receiver, Watertown High School

"You’re the best in the business..."

“You’re the best in the business and I couldn’t be happier to put my off-season development into your hands.”

- Ben Robertson, Cornell Hockey

"...your stuff has helped me optimize our training when our head coach wants me to condition them at practice!"

“Gerry, thanks for all your great content! Our S&C coach does a great job and handles a vast majority of our pitchers training, but your stuff has helped me optimize our training when our head coach wants me to condition them at practice!”

- Chris Marx, Assistant Coach Purdue Baseball

"...I got #1 in acceleration and #3 in fastest overall speed..."

“Would you believe me if I told you I increased on all my speed testing! I can’t wait for my player meeting and for my coach to ask what I did. I got #1 in acceleration and #3 in fastest overall speed and agility on my team which were all PR’s.”

- Emerson Elgin, ​Left Back, UNC Women’s Soccer

"...best money I spend each month."

“We are finishing week 6 of the off-season programming today - and loving everything about it! Best money I spend each month.”

- Douglas Baylis, Pitching Coach, Memorial High School (Texas)

Frequently Asked Questions

Do we get exact programs with detailed reps, sets, loading, and progression?

Yes! In our OnlyStrength app you’ll get all the details, how-to videos, sets, reps, loading guidance, and progressions you need to train safely and effectively on your own right on your phone.

Do you offer training that is different for in-season, off-season and youth athletes?

Yes! You’ll have access to both offseason and -inseason programs. Just follow the one you need at that time.

Are the programs updated year round?

Yes, the programs are updated every two weeks.

Are we able to ask questions as we go?

Yes! You'll have direct access to ask me questions in our forum. I’ll be with you for guidance every step of the way.

Meet The Founder, Gerry Defilippo

Owner of Challenger Strength Fitness

Since 2016, Gerry DeFilippo has trained youth, high school, college and pro athletes full time.

In the past eight years since starting his performance facility, Challenger Strength, Gerry and his staff have overseen the development and training of over 150+ college and pro athletes across 61 (and counting) collegiate programs and professional organizations.

Gerry and Challenger Strength specialize in getting athletes to move faster, better and aid in their overall performance development to bolster their performance in their respective sports.

In addition to this, Challenger Strength serves as the official training provider for various collegiate and competitive club sport organizations in New Jersey. Additionally, Gerry has served as a special advisor to the New York Yankees' player development team since 2020 and continues to have his thoughts on speed training published in their yearly organizational handbook for all minor league and major league coaches and players.

Since 2016, Gerry has also had numerous articles published on major sites such as EliteFTS and Muscle and Strength highlighting his thoughts on strength and speed training for athletes.

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