Rest days are an important part of any exercise routine. ... Rest days allow the muscles to replenish their glycogen stores, thereby reducing muscle fatigue and preparing the muscles for their next workout. Preventing injury: Overexercising puts repetitive stress and strain on the muscles, increasing the risk of injury.

Is it OK to work out every day?

As long as you're not pushing yourself too hard or getting obsessive about it, working out every day is fine. Make sure it's something you enjoy without being too strict with yourself, especially during times of illness or injury.

Are rest days really necessary?

Rest days are incredibly important, as they allow your body to recover. Without proper rest, your body and muscles don't have the necessary time to rebuild and rejuvenate, which can cause some nasty side effects. “If we don't give our body rest days, the stress will add up.