What is the proper amount of exercise each day/how many days per week? If you're feeling tired, is it better to exercise or wait until the next day? 
– Seth*

Experts recommend teens get at least 1 hour of moderate to vigorous exercise daily. If exercise has left you worn out, it's good to rest for a day. In fact, taking a day off is a requirement for certain types of exercise — like strength training. This helps the body repair itself and protect itself from injury. Tiredness or aching in the muscles is the body's way of telling you it needs a break. If you're still feeling tired after taking a few days off, talk to your doctor.

For more information, check out these articles:
Compulsive Exercise
Exercise
Sports and Exercise Safety
Strength Training
Why Exercise Is Wise

Reviewed by: Larissa Hirsch, MD
Date reviewed: September 2006

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Although we can't reply personally, you may see your question posted to this page in the future. If you're looking for medical advice, a diagnosis, or treatment, consult your doctor or other qualified medical professional. If this is an emergency, contact emergency services in your area.

*Names have been changed to protect user privacy.