← BACK TO ITERUM
WHY THIS MATTERS

A public health crisis.
Not a fitness problem.

People start. They see no proof. They quit.

50%
quit within 6 months
Sperandei, 2016
−27%
lower mortality risk at 60 min/wk
Momma et al.
+16%
higher mortality risk per 5kg grip lost
Soysal, 2021
The industry calls this a motivation problem.
The data says it's a measurement problem.
THE DROPOUT CURVE

Progress rises. Then it disappears.

Strength is improving, but the signals people trust — mirrors, scales, wearables — fail to show it. By the time the body changes, half the room is gone.

Progress rising →← They give upWEEK 1Motivation peaksWEEK 4Novelty fadesWEEK 6–12Progress becomes invisibleStrength is rising, but mirrors, scales, and wearables miss it.MONTH 650% have quit
THE EVIDENCE

The dose is small.
Most never reach it.

−15%
Am. J. Prev. Med., 2022
All-cause mortality

Any resistance training cuts all-cause mortality 15%, cardiovascular 19%, cancer 14%.

1.5M+ participants
−27%
Momma et al.
Lower mortality risk at 60 min/week

Benefit peaks around 60 minutes per week. Plateaus by 120. The dose is small.

Nonlinear dose-response
+16%
Soysal et al., 2021
Higher mortality risk per 5kg grip strength lost

Grip strength independently predicts cardiovascular disease, diabetes, cognitive decline, and sarcopenia.

28 meta-analyses reviewed
50%
Sperandei et al., 2016
Quit within 6 months

Adherence collapses between weeks 6–12 — exactly when novelty fades and progress becomes invisible.

Two predictors: no visible progress, no structured guidance
THE BROKEN FEEDBACK LOOP

None of it gives an objective measure.

Heart rate
15–57% error in resistance training
Formulas calibrated on treadmills.
Calories
Estimated, not measured
No signal for adaptation.
Perceived exertion
Tracks fatigue, not progress
Feels heavy ≠ getting stronger.
The mirror
Lags months behind force gains
Strength changes before shape does.

Without an objective measure, progressive overload is guesswork.

▸SOURCES
  1. Momma, H. et al. (2022). Muscle-strengthening activities and mortality: meta-analysis (n > 1.5M). Am. J. Prev. Med.
  2. Nonlinear dose-response meta-analysis of resistance training and all-cause mortality — peak −27% at ~60 min/week.
  3. Soysal, P. et al. (2021). Handgrip strength and health outcomes: umbrella review. PMC8167328.
  4. Sperandei, S. et al. (2016). Adherence to physical activity in unsupervised settings — ~50% attrition within 6 months.
  5. Ponce-González, J.G. et al. (2025). Muscle Power vs. Strength as a Predictor of Mortality. Mayo Clinic Proceedings.
  6. Health & Fitness Association (2024–2025). Industry Benchmarking Report — 77M members; ~67% unused; 66.4% retention.

An objective measure is the missing signal.

See how ITERUM measures it.
← BACK TO ITERUM