"3 weeks into your program...I'm already 8 lbs down and feel my explosiveness coming back!"
If You Woke Up 30 Days From Today Stronger, Faster, & More Athletic, How Would Your Coach React?
Would he be stunned? Proud? A mix of both? Read on to see a story that will make you rethink what's possible.
Dear Athlete,
Charles Deprima was a young athlete battling fatigue, inconsistency, and a demanding sports and school schedule.
His days were a blur of early mornings and late nights, desperately trying to balance workouts with academic commitments.
The constant grind felt like an uphill battle, and the results were painfully inconsistent.
Like many athletes, Charles tried all the typical approaches to improve.
He used generic programs he found on the internet, followed the team workouts that often seemed to make things worse, or just hit the gym and lifted like a bodybuilder, thinking doing something was better than nothing.
The right programming seemed either too expensive, too intense to be enjoyable, or too complicated to understand.
Then one day, he decided to come train at Challenger Strength, my facility in New Jersey.
I saw the potential in Charles and understood the unique challenges he faced. Unlike other coaches who offered generic advice, I tailored a plan specifically for him.
I knew he needed a regimen that would fit seamlessly into his busy life, one that would allow him to train effectively without burning out.
We started small, focusing on building a sustainable routine. Charles found a rhythm, and his workouts became fun. This made consistency a breeze.
With each passing week, he saw incremental improvements.
His speed began to increase, his strength grew, and slowly but surely, his confidence started to build.
But progress is never linear.
There were setbacks—days when the fatigue defeated his discipline, when the demands of school and sports threatened to derail his training.
Yet, every time he stumbled, I was there to help him back on his feet, adjusting his program and offering the encouragement he needed to keep pushing forward.
By the time Charles reached high school, the results of his hard work and dedication were undeniable.
His 40-yard dash time dropped to an impressive 4.4 seconds, catching the attention of college scouts.
The athlete who once struggled to keep up was now a force on the field, and colleges took notice.
His efforts earned him an offer to play Division 1 football at Harvard.
His childhood dream was fulfilled.
His confidence was sky-high.
All because he found a way to train that made it easy to get results and stay consistent.
Now, I’m offering that same level of support to thousands of athletes.
The same support that helped Charles overcome his challenges and achieve his dreams can help you too.
No hype, no shortcuts—just a proven path to becoming the best athlete you can be.
"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
“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
UNC Women’s Soccer '25
Decades of Training Expertise Simplified for Athletes of All Levels.
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.
Slow & Steady
Month to Month
$19.99/mo
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 Today
Annual
$199.99/yr
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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