Jennifer Aniston’s toned abs and youthful-looking physique are perhaps not as surprising as the manner in which she achieved them.

Aniston, 56, is the face—and body—of Pvolve, a resistance workout method that involves small, precise exercises to target even hard-to-isolate muscles. It involves no high-impact movement and uses really light weights. In fact, the heaviest weight you will use in a Pvolve session is three pounds, a load that might be lifted with the little finger by many of the gym-strength brigade. Can micro-lifting in this way really get you strong?