89-year-old weightlifters. 99-year-old marathoners. The back of SI is full of them. People who forgot to retire. And never got old. People wo realied: It’s easier to keep going if you never stop.

JUST DO IT.

Get up. Get out. Build up the muscle. Get rid of the flab. Go back to school. Sell the TV.

JUST DO IT.

Master the curveball. Pound the bag. Rebuild an engine. Jump-start a career.

JUST DO IT.

Bench press four big plates. Dig for fossils. Bicycle across Canada. Save an endangered species – yourself.

JUST DO IT.

The only one who can tell you you can’t is you. And you don’t have to listen.