Simple Steps to a Healthier You

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push-ups

Jessica Biel's Arms

Her secret weapon: Jason Walsh, Los Angeles–based trainer

His top arm move: Push-Ups

Why it’s great: “When I say this is a must-do exercise, most women look at me like I’m crazy,” Walsh admits. “But everybody I train ends up doing push-ups at some point because they are so beneficial. They help you get incredible arms!”

How to: Lie on your stomach with your hands just outside your shoulders, elbows bent to about 45 degrees, and fingers spread; your toes should be tucked under with legs straight and abs pulled in tight. (For less of a challenge, start with your hands on a raised surface, like a tabletop.) Take a deep breath and push yourself up, keeping your body in a straight line—don’t push hips up or let belly drop toward the floor. Slowly lower yourself back down to the starting position. Work your way up to 3 sets of 10 reps.

Next: Halle Berry's back and shoulders