As a result, working out facial muscles pulls on the skin and will stretch it out, not tighten it. “The truth is that many of our facial wrinkles come from excess muscle activity,” Spiegel says. Laugh lines, crow's feet, and forehead wrinkles all come from using facial muscles.

Does exercise cause aging?

"It tends to wither people and, like anything done to excess, it will age you." After prolonged exercise, such as a 25-mile run, the body changes its metabolism, with a resulting increase in free radicals, atoms that can cause permanent damage to your cells and can also speed up the ageing process.

Does exercise build collagen?

“Exercise actually supports the production of collagen,” says Amy Dixon, a Los Angeles–based exercise physiologist and celebrity trainer. “The boost in this protein helps to keep your skin firm, supple, and elastic.” Regular exercise boosts circulation.