Here's how: With your hands against the edge of a desk or table, raise your body until just before your elbows fully lock, then slowly lower your body to desk or table level. Repeat for 15 reps.

Get ready

Before you do these exercises, Mr. Orvis recommends warming up with 5 to 10 minutes of walking, then doing a few reps of the exercises you'll do that day.

"Always cool down afterward with 5 to 10 minutes of stretching," says Mr. Orvis.