Read the guide · Training
How Much Exercise Is Enough
The most common question is not what the ideal workout is, but what workout is feasible. International guidelines call for 150 to 300 minutes of moderate activity per week plus two strengthening sessions—and the most recent literature shows that this time can be accumulated in short bouts without losing the benefit. Letz does not reject a 15-minute session: it cuts back exercises while preserving essential movement patterns and tells you what was left out.
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 |
| Weekly sets per muscle group | 10–20 sets/week2 variants by context | 90% | Ten or more weekly sets per muscle produce greater hypertrophy; below four, the stimulus is insufficient; above twenty, returns diminish.Weekly Volume: Sets per Muscle Group · Minimum Effective Dose and Time-Efficient Training |
| Rest for compound exercises | 90–180 seconds | 60% | Compound exercises perform better with two minutes or more of rest; 90 seconds is the floor when time is limited.Rest Between Sets · Minimum Effective Dose and Time-Efficient Training |
Rules and studies
- 01Physical Activity Guidelines for AdultsAdults 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.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.
- 02Accumulated Activity in Short BoutsAccumulating activity across multiple short bouts throughout the day provides benefits similar to a single continuous session.Days without time for a full session receive an express alternative; the coach counts short bouts as valid activity, not as a failure.
- 03Minimum Effective Dose and Time-Efficient TrainingA few well-executed sets, two to three times a week, already yield meaningful gains; supersets and combined sets shorten the session without losing volume.Sessions of 15 to 30 minutes are never dismissed: the generator trims exercises and sets while preserving foundational movement patterns and the volume floor.
- 04Strength, Conditioning, and LongevityMuscle-strengthening activities for 30 to 60 minutes per week and higher cardiorespiratory fitness are associated with lower mortality and fewer chronic diseases.Even users who only want to lose weight get two days of resistance training; Letz shows how much of the week covers strength and cardio.
- 05Exercise and Blood PressureMultiple exercise modalities reduce resting blood pressure; isometric and combined training were the most effective in the network comparison.Users who report hypertension receive a low-impact plan, are cued to avoid holding their breath during exercise instructions, and are guided to maintain medical clearance.
- 06Exercise, Depression, and AnxietyPhysical activity reduces symptoms of depression, anxiety, and psychological distress in adults, showing a moderate effect that is larger at higher intensities and in shorter interventions.The coach highlights mood benefits as a legitimate reason to train and refers to a professional when there are signs of distress.