MedX clinical study — Gainesville, FL
76 untrained adults, 10 weeks of single-set HIT. Average strength gain of 50% across major lifts. Reported in McGuff & Little, Body by Science (2009).
The 12-minute protocol
Train once a week. Stay strong at eighty.
Intensiq is a guided High Intensity Training app based on Dr. Doug McGuff's Body by Science. Five slow, brutal sets. Twelve minutes. Once a week. That's the entire workout.
No credit card. First 100 founding members get lifetime pricing.
12 min
of weekly training
1×
per week
5 sets
of slow resistance
30+ yrs
of clinical data
The problem nobody talks about
You are not running out of time. You are running out of muscle.
01
1 in 4 adults over 65 falls each year. Most never fully recover.
02
After 30, you lose 3–8% of muscle mass per decade — silently.
03
Weak grip strength predicts early death more reliably than blood pressure.
04
Most people spend their last decade unable to stand from a chair unaided.
A tale of two trainees
Same goal. Two completely different bets.
The grinder
Mark, 42
5 hrs / week
- —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.
Time spent per year≈ 260 hrs
The Intensiq trainee
Sarah, 42
12 min / week
- —One slow, focused session a week. Five exercises. Twelve minutes.
- —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.
Time spent per year≈ 10 hrs
Mark isn't lazy. He's been told more is more. The science says otherwise — and has for thirty years.
The science, plainly
Why one slow set beats five hard ones.
Muscle grows in response to deep fibre fatigue, not to time spent. A single set taken to true momentary failure recruits every fibre available — including the high-threshold ones that the next four sets never reach.
Conventional 5-day split vs Intensiq weekly HIT
Strength over a decade
Less volume, more recovery → consistent strength gains year over year.
One set taken to failure vs three lighter sets
Muscle fibre recruitment
Slow cadence + failure recruits 97% of available motor units.
01
Slow cadence
10 seconds up, 10 seconds down. Eliminates momentum, isolates the muscle, removes injury risk almost entirely.
02
Train to failure
Push every set until one more rep is physically impossible. This is the only signal the body needs to adapt.
03
Recover fully
Adaptation happens between workouts, not during them. Wait until you're 100% recovered — usually 7 days.
What the research says
Not a new fad. Three decades of peer-reviewed data.
Westcott & Winnett, 2008
Single-set vs multiple-set training in 1,644 subjects across multiple studies — no significant difference in strength gains. Volume is not the driver.
Carpinelli & Otto meta-analysis
Reviewed 70+ training studies. Concluded that one set per exercise, taken to muscular failure, produces equivalent gains to multiple sets in untrained and trained populations alike.
Tufts University sarcopenia research
Resistance training in adults aged 65–96 reversed muscle loss equivalent to two decades of aging in just 12 weeks. Strength training is the single most powerful anti-aging intervention.
References curated from Doug McGuff & John Little, Body by Science (McGraw-Hill, 2009); Westcott, ACSM Health & Fitness Journal; and Carpinelli, JEPonline.
How Intensiq works
A workout you can do in a lunch break.
01
Pick the Big Five
Chest press, pulldown, overhead press, seated row, leg press. Or substitute compounds you can do safely.
02
Slow it down
The app guides you through 10-second lifts and 10-second lowers. Smooth, controlled, no momentum.
03
Push to failure
Continue until the bar literally won't move. Intensiq tracks time-under-load and tells you exactly when you're done.
04
Recover, log, repeat
One week off. Intensiq remembers your weights, your reps, your progression — and notifies you the moment you're ready again.
Founding members
€29/year, forever. Only 100 spots.
Lock in lifetime pricing while we're still validating. After the 100th sign-up, Intensiq goes to its regular price and we never bother our founding members again.
Early bird · 77 of 100 left
€29€89/year, forever
- ✓Full HIT tracker — Big Five, custom routines
- ✓TUL timer, slow-cadence guide, voice coaching
- ✓Set-by-set video recording for form review
- ✓Recovery scheduling & weekly reminders
- ✓Lifetime price-lock as a founding member
23 claimed77 spots left
Common questions
Honest answers, no hedging.
Is twelve minutes really enough?+
Yes — when those minutes are taken to true momentary failure. Decades of research, including the data summarised in Body by Science, show that single-set HIT produces equivalent or superior strength gains to multi-set conventional training. The variable that matters is intensity, not duration.
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?+
Intensiq 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.
Twelve minutes. One week from now, start.
The strongest version of you at 80 is being built — or lost — by what you do this week. Pick the science.