RESEARCH-GRADE TRAINING TOOLS
Science-backed training
for athletes who take it seriously.
Critical Force for climbers. Lever torque for calisthenics. RPE autoregulation for lifters. Real periodization across 7 disciplines — built on peer-reviewed research, not influencer opinions.
Free to start. Pro from $3.49 / mo. Elite from $7.99 / mo.
Built for every serious training path.
Seven disciplines, each with its own scientific literature, its own zone system, its own periodization model.
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Sport Climbing
Critical Force. Hangboard periodization. CNS fatigue tracking.
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Calisthenics
Lever torque analysis. Planche biomechanics. Progressive overload.
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Powerlifting
RPE autoregulation. DUP cycles. Nervous system load.
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Bodybuilding
MEV/MAV/MRV. Myofibrillar hypertrophy. Volume landmarks.
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CrossFit
MetCon pacing. Energy systems. Recovery ratios.
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Boxing
Aerobic / anaerobic split. Heart rate zones. Sparring load.
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Recovery
Sleep debt. Nervous system status. Readiness scoring.
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Why FitX is different.
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Peer-reviewed, not prescriptive.
Every calculator cites its paper. Every zone threshold has a name behind it. When we can’t cite, we don’t claim.
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Long-term, not daily.
Forget "today’s calories." FitX asks how your Critical Force is trending this quarter, whether you’re plateauing, and what your cross-discipline load looks like.
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Private by design.
Your training data never leaves Firebase. Export to coach means you send the file — we don’t transmit on your behalf. Algorithms run server-side so your numbers stay yours.
Pricing built on restraint.
Free isn’t a trap. Pro isn’t locked down. Elite is research-grade. Pick what fits, upgrade when you need more.
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Free
Start with real science.
$0 forever - MOST POPULAR
Pro
Session logging + progression
$3.49 / month -
Elite
Research-grade tools
$7.99 / month
Ready to train smarter?
Install once. Pay only when you outgrow Free.