You are not running out of time. You are running out of muscle.
About 1 in 4 adults over 65 falls each year. Most never fully recover.[src]
From your thirties onward, muscle mass declines decade after decade. Silently.[src]
Grip strength is one of the strongest simple predictors of long-term mortality risk in large cohort studies.[src]
Losing lower-body strength is closely tied to losing everyday independence, and supervised strength training has improved both in older adults.[src]
8 weeks of supervised high-intensity strength training rebuilt strength and mobility in adults aged 86–96. Age is not the barrier. Inaction is.[src]
What everyday life
feels like at 80
If your max is low, a laundry basket is a max effort. Drag to see where you're headed.
Getting up from the floor
Getting up from the floor
- Getting up from the floormax effort100% of your max effort
- Carrying a laundry baskethard53% of your max effort
- Groceries from the carhard67% of your max effort
- Picking up your grandchildmax effort80% of your max effort
- Lifting a carry-on overheadhard73% of your max effort
- Climbing stairs without restnot happeningbeyond your capacity
Most tasks are manageable, but a few still push your limit. More reserve means more life.
A brief, progressive strength session can help build strength reserve. Frequency should match recovery, experience and medical context. That's the premise behind Intense Fit.
Why controlled effort can be enough.
As a hard set continues and fatigue rises, the body progressively calls on more of the available motor-unit pool to keep the weight moving. That's why a small amount of well-executed, high-effort work can be a meaningful stimulus, without needing to reach momentary failure. Higher muscular strength is consistently associated with lower all-cause mortality in large cohort studies[src].
See the research →The strength coach who reads the research so you don't have to.
Intense Fit's AI reads your last session, your recovery inputs, your training history and your weakest lift, and recommends when to train those muscles again. It suggests the weight, calls the tempo, and watches every rep through your camera, tracking cadence and time under load so you can see how hard the set actually was. A short session, typically about 12 minutes, with much less guesswork.
It calibrates to you, your age, training experience, injury limitations and starting strength, so the first session already fits whether you are new to machines or coming back after years away.
A workout you can do in a lunch break.
Pick the Big Five
Chest press, pulldown, overhead press, seated row, leg press. Or substitute compounds you can do safely.
Slow it down
The app guides you through 10-second lifts and 10-second lowers. Smooth, controlled, no momentum.
Train with controlled effort
Keep going while your cadence and form hold, so effort stays high and technique stays intact. Intense Fit tracks time under load and guides when to stop. Reaching failure is optional context, not a requirement.
Recover, log, repeat
One week off. Intense Fit remembers your weights, your reps, your progression. And notifies you the moment you're ready again.
Every set, measured. Every session, decided.
- ● 8 hours of sleep tonight
- ● ~130g protein/day
- ● Walk, don't lift
Test Intense Fit before the public launch.
Run real workouts, tell us where the experience gets in your way, and help shape the Android release. Apply with the Google account you use on your Android phone.
Closed testing via Google Play- Sleep is your main recovery lever
- Protein across the day
- Walk, don't lift
Same goal. Two completely different bets.
- -Hits the gym 4 days a week. Runs another two.
- -Drives to the gym, changes, warms up, lifts, showers, drives home. 75 minutes a session.
- -Sore most mornings. Knees ache. Lower back is a coin flip.
- -Plateaus every six months. Drops out twice a year for ‘rest’.
- -In ten years he'll be tired of it. In twenty, he'll have stopped.
- -One slow, focused session a week. A handful of exercises. In and out.
- -No cardio plan. No split routine. No supplements.
- -Strength climbs every single week. Measurably, in the app.
- -Fully recovered before the next session. No injuries, no plateau.
- -In twenty years she's still adding weight to the bar.
Mark isn't lazy. He's been told more is more. The science says otherwise. And has for thirty years.
I hated the gym. Then I read one book. And started treating my body like a spreadsheet.
. Filipe Meunier, founder of Intense Fit
The core tracker is free forever. No card, no trial timer. Pro unlocks coach cues and form analysis if you want them — but you never have to pay to use Intense Fit.
I hated the gym until I read one book — Body by Science by Dr. Doug McGuff. For the first time someone treated training as a controlled biological stimulus: one brief session, full recovery, measured progression. A protocol you could prove or disprove.
Real screenshots from my own spreadsheet — the same logic now lives inside Intense Fit, so you don't need the spreadsheet.
I started with the leg press at 71.5 kg. Seventeen months later, one set a week, I was pressing 105 kg. No supplements, no five-day split. Just the protocol, logged.
The spreadsheet got unmanageable, so I built Intense Fit. It's the app I wished I'd had on day one.
Every set, reviewed.
A HIT coach that helps you review how you move.
Most coaches watch. Most apps don't. Intense Fit records each set automatically so you can review your tempo, depth and form between sessions — and catch the one technical breakdown you never felt happening. No guesswork. No wondering if you're actually doing it right.
What people actually said.
Copy-pasted from emails, the beta chat, and the post-session survey. Names shortened, everything else left as it came in.
email, week 3“20 years of HIT in a spreadsheet. deleted it after two sessions on this.”
beta chat“chest press went from 40 to 55kg in about a month. once a week. I keep waiting for the catch.”
survey“First time an app didn't try to sell me a six-week shred. it just runs the protocol and shuts up.”
“the timer + the voice is the whole thing. I finally know what failure actually feels like.”
beta chat“my dad's 71 and using it. he texts me the weight after every session now, unprompted.”
Built for hypertrophy, not vanity metrics
Most workout apps log tonnage and streaks. Intense Fit tracks load, time under load, cadence, range of motion and repeatability together, so a set can be compared with the one before it. Time under load is a useful session metric, not a standalone guarantee of hypertrophy. Every session, every movement.
Progressive overload, written for you each week
Complete your time-under-load target with stable form and controlled cadence, and the app proposes more load next session, weighing your recovery and recent sessions. Fall short, or lose control of the tempo, and the weight holds. Failure is not required. No spreadsheets, no deload weeks pulled from a forum — Intense Fit runs the rule for you.
Why lower-frequency training can work.
How often you train depends on dose, recovery and experience. Tap any clip to unmute and hear the story at real speed.
Honest answers, no hedging.
Can a session this short do anything?+
For many trainees it can, when the working sets are hard and well executed. Multiple supervised studies, including the data summarised in Body by Science, report meaningful strength gains from single-set training with a much smaller time commitment than multi-set programmes. Effort and execution matter more than duration, and results vary with experience, recovery and consistency. Your first sessions may run closer to 20 minutes while you learn the cadence; about 12 minutes is a typical length after that.
How will I know it's actually working?+
Mainly by the weight on the bar over time. Intense Fit graphs your load and time under load for each of the Big Five, session over session. If the curve trends up while your cadence and form hold, the training is working. Many users see measurable strength signals within their first few completed sessions, assuming consistent effort, accurate logging and adequate recovery.
How long until I see results?+
Most users should expect measurable strength signals within their first 3–4 completed sessions, assuming consistent effort, accurate logging, and adequate recovery — your nervous system learns to recruit more fibres early. Visible muscle change: 8–12 weeks. Posture, walking confidence, the feeling of being solid on your feet: usually inside a month. The scale is the slowest and least useful signal. Ignore it.
What exactly should I track? I don't want to turn into a data nerd.+
Two numbers per exercise: the weight, and the time under load for the set. That's it. Intense Fit logs both in about fifteen seconds, alongside your cadence and range. Heart rate, calories and step counts tell you far less about whether you're getting stronger.
How do I know I'm working hard enough without a trainer?+
A useful endpoint is the last rep you can complete with your cadence and range intact — technical failure. Pushing beyond that, all the way to momentary failure, is optional context rather than a requirement, and it isn't appropriate on every lift or for every trainee. The slow cadence and on-screen guidance make the endpoint far easier to judge than counting reps.
What if I skip a week. Does that ruin progress?+
No. One week off is recovery, not regression, and two weeks off is usually fine too. A low-frequency protocol is designed around life happening: travel, illness, a hard work stretch. Intense Fit picks up where you left off instead of punishing missed days.
Why do most people quit tracking within six months?+
Because most trackers measure the wrong things and demand daily attention. Intense Fit asks for two numbers per exercise and shows you a strength line you can actually read. That feedback loop is why many HIT trainees stay with this style of training for years.
I'm 65. Is this safe?+
Slow-cadence resistance training is one of the safest forms of exercise. There's no momentum, no impact, and no eccentric overload. The American College of Sports Medicine recommends progressive resistance training as the single most important exercise modality for adults over 60.
Do I need a gym?+
Ideally yes, but not necessarily a fancy one. The Big Five maps cleanly onto any commercial gym with selectorised machines. We're also building a bodyweight track for travel weeks.
Will I lose weight?+
Intense Fit is a strength protocol, not a weight-loss programme. That said, more muscle means a higher resting metabolic rate, and many users report fat loss as a natural side-effect when nutrition is in order.
One focused session at a time.
Strength is built session by session, and it responds to consistent, controlled work. Start with one.