How many days per week should adults perform resistance exercises for each major muscle group?

How many days per week should adults perform resistance exercises for each major muscle group?

• A. 1 day per week
• B. 2-3 days per week
• C. 4-5 days per week
• D. 6-7 days per week

Answer: (B)

The key idea is that muscles grow best when they’re stimulated multiple times across the week, not just once. When you resistance train a muscle, protein synthesis stays elevated for about a day or two, so repeating the stimulus within a week builds more total training volume and promotes adaptation more effectively. For most adults, hitting each major muscle group a couple of times up to three times weekly provides a practical balance: enough frequency to drive progress while leaving time for recovery between sessions. This approach underpins common routines like full-body workouts 2–3 days per week or upper/lower splits that still train each muscle group more than once weekly. Trying to train a muscle group only once per week can underload the weekly stimulus and slow gains, while training extremely frequently (nearly every day) can be unnecessary for most and may require careful planning to avoid overtraining.