Training · Moderate evidence
Physical Activity Guidelines for Adults
Adults should accumulate 150 to 300 minutes of moderate-intensity activity per week, or 75 to 150 minutes of vigorous-intensity activity, along with muscle-strengthening activities on two or more days.
WHO guidelines and ACSM position stand · 2 sources · 2 min
What the studies show
- 150 to 300 minutes per week of moderate-intensity activity, or the vigorous equivalent, for substantial health benefits.
- Muscle-strengthening activities on two or more days per week.
- Reducing sedentary time provides additional benefits at any level of physical activity.
How Letz applies it
The workout screen tracks weekly minutes—guided workouts, running, swimming, classes, manual entries, and connected activity—against the 150-minute guideline, counting vigorous minutes as double and keeping yoga separate from aerobic activity, all in a single progress bar.
Numbers derived from this rule
| Parameter | Range | Weight | Rule |
|---|---|---|---|
| Resistance training sessions per week | 2–4 sessions/week | 70% | Two or more strengthening sessions per week; weekly consistency forms a habit in about six weeks.Physical Activity Guidelines for Adults · Frequency: training each muscle at least twice per week · Building a workout habit |
| Moderate activity per week | 150–300 minutes/week | 60% | 150 to 300 minutes of moderate activity per week, accumulated in any pattern of bouts.Physical Activity Guidelines for Adults · Accumulated Activity in Short Bouts |
Who it applies to
General adult population, including individuals with stable chronic conditions.
Limits
These are population-level targets; any amount above zero already confers benefits, and progression should be gradual.
Sources
- Bull et al., British Journal of Sports Medicine, 2020 DOI 10.1136/bjsports-2020-102955
- Garber et al., Medicine & Science in Sports & Exercise, 2011 DOI 10.1249/MSS.0b013e318213fefb
More in Training
- Resistance Training, Strength, and HypertrophyVarious training prescriptions improve strength and hypertrophy; heavier loads favor strength, and multiple sets favor hypertrophy.
- Weekly Volume: Sets per Muscle GroupMore weekly sets per muscle produce greater hypertrophy, with diminishing returns; for strength, moderate volumes already capture most of the gains.
- Frequency: training each muscle at least twice per weekTraining a muscle group twice a week is superior to once for hypertrophy; for strength, higher frequency helps primarily because it distributes volume more effectively.
- Load and rep rangeLight and heavy loads produce similar hypertrophy when sets are taken close to failure; heavy loads are superior for maximizing strength gains.