Strength that adapts to you
Slept four hours? Today's session is already lighter. New: trainer-grade exercise selection, warm-up sets on every card, and rest-timer alerts.
Every fitness app asks what you did.
Fit4i decides what you do today — and tells you why.
Slept four hours? Today's session is already lighter — and you still don't lose the week.
TRAIN SMARTER
A log stores the past. A coach makes a decision. Every morning Fit4i has today's session waiting — exercises, sets, reps and working weights, already chosen. A readiness score built from last night's sleep, HRV and resting heart rate (Apple Health — or a ten-second check-in if you don't wear a watch) shapes the plan. Tap "Why this workout?" and it walks you through the reasoning, the way a good trainer would.
PROGRAMMED LIKE A COACH, NOT A CALCULATOR
• Exercises picked the way a trainer picks them: the main lift opens the day, every leg day trains the posterior chain, pressing and pulling stay in balance.
• Warm-up sets calculated from your working weight — right on the workout card.
• Weights and reps advance on their own as you get stronger. Volume climbs in waves and backs off in planned deloads — real periodization, not "add 2.5 kg forever".
• New to lifting? You start with movements you can actually do — assisted variations instead of strict pull-ups on day one.
• Something hurts? Report it: risky movements disappear, the rest carries a "careful" note — instead of your program losing half its exercises.
MASTER EVERY EXERCISE
Step-by-step 3D guides for every movement: setup, working phase, return. What you should feel and what to avoid — in plain language.
TRACK WHAT MATTERS
Calorie, protein and fiber targets tied to your goal — and they shift as your bodyweight trends. Log meals in seconds, scan a nutrition label, track water, and add supplements with the scoop math done for you.
IT BENDS TO YOUR LIFE
• Twenty-five minutes instead of sixty? One tap reshapes the session — the main lift survives.
• Back after weeks off? Comeback mode rebuilds you gently. No guilt, no injuries.
IT LIVES ON YOUR LOCK SCREEN
Start a session and your workout appears on the Lock Screen and in the Dynamic Island: current exercise, set count, and a rest timer that counts itself down. On iOS 17 and later you can log a set without unlocking. The phone stays in your pocket, where it belongs.
A SAFETY CHECK FIRST
Before your first session Fit4i runs a short readiness questionnaire (PAR-Q). It takes a minute. It's guidance, not a diagnosis.
COACH-LEVEL PROGRAMMING. NOT THE COACH-LEVEL PRICE.
Free forever: build your program, log every workout, and watch your working weights advance automatically — plus full nutrition, water, bodyweight and supplement tracking.
Your first 14 days of Pro are free. Pro adds the thinking layer: programs built around your goal and level, periodization with planned deloads, recovery-driven daily adjustments, and calories that adapt to your weight trend. The subscription renews automatically; cancel anytime in Settings.
Works in kg or lbs — at the gym, at home with dumbbells, or with nothing but your bodyweight.
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Learn more: https://fitai-web.pages.dev
Fit4i provides general fitness guidance and is not a medical service. Consult a physician before starting any exercise program.
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