Forget anti-aging creams, plastic surgery, and time machines. The only thing you need to live like you're 10 years younger is exercise.

Studies show that the most physically active folks show signs of being as much as 10 years younger on a cellular level. How can this be? Well, exercise keeps telomeres long and healthy. Telomeres are the caps on your DNA in all of your cells. Over time, they shorten, stop regenerating, and eventually die. Shortened telomeres cause us to age, and they also leave chromosomes vulnerable to damage, which can lead to diseases such as cancer. Exercise and you'll keep these buggers fit for a young life.

Pretty basic stuff. Exercise = healthy telomeres = younger cells = younger you. Got the formula? Good.

Here, more tips on how to keep your telomeres alive and well.