What Is F13
More Than
A Gym Floor
F13 Performance is where coached training and 24/7 open gym come together at Resistance Strength. Small-group classes, structured programming, HYROX prep, adult conditioning, and sport performance for student athletes. F13 Performance is open 24/7 for training on your own. Two memberships, one for coaching and one for 24/7 access. Combine them or pick one.
With Resistance Strength · Allentown
The Setup
Coached Training,
Built To Progress
Every class is coached and every week of programming builds on the last. We run strength cycles so you actually get stronger. Whether you're done winging your workouts or you want a greater challenge, this is where it starts delivering results.
F13 is small-group by design. Sessions are capped so your coach sees your reps and adjusts the weight when you need it. If something is off, they step in. You are not one of 40 people guessing your way through a whiteboard.
A Resistance Strength membership gets you 24/7 access to both facilities. F13 coached classes are a separate membership. Add them to your plan, or join F13 on its own. Either way, you are in.
The Framework
The 4S Method
Four pillars woven through every training block. Not one at a time. Every session touches all of them because real training demands all of them.
Strength
Get stronger. Feel it everywhere.
Every session is built to make you measurably stronger over time. Progressive overload, smart programming, and the right equipment so you are not just working hard, you are actually getting somewhere. Strength built here carries over to everything: sports, work, life.
Stability
A strong foundation prevents everything.
Most injuries happen when strength outpaces control. We train your core, joints, and posterior chain to move with stability under load, so you stay healthy, train consistently, and build a body that holds up long-term. This is the work most gyms skip.
Skill
Move well. Then move heavy.
Technique is not a beginner thing. It is everything. We coach the movements that matter: squats, pulls, presses, carries. You will learn to move with precision at lower intensity before adding load, so your form improves alongside your fitness rather than breaking down under it.
Sweat
Conditioning with a purpose.
F13 conditioning is not random cardio. It is targeted. Each session trains specific energy systems, improves your capacity under fatigue, and builds the kind of engine that makes everything else easier. You will leave spent, but never wrecked without reason.
Race Ready
HYROX Training
In Allentown
Every piece of HYROX race-day equipment is on the floor at F13. SkiErgs, rowers, sleds, sandbags, wall balls, runway for the run splits. Programming is built to mirror race demands so when you line up, you already know the work.
See the HYROX setup →
First Time?
Come See It For Yourself
Come in, meet the coaches, see the space. Book a tour, no obligation, no pitch on the way out.