Even if you haven't tried one since gym class, the multitasking push-up deserves a prime spot in your fitness routine.

"People think push-ups are all about the arms. They're actually one of the only total-body exercises," says mind-body fitness expert Ellen Barrett. Beyond strengthening biceps and triceps, push-ups also tone the chest, shoulders, back, core, and legs.

If you're struggling, don't feel bad about bringing your knees to the floor. You'll learn alignment as you build necessary upper-body strength. Here's how to do it:

1. Start on Hands and Knees
Keep hands under shoulders and index fingers parallel.

2. Step Your Legs Back
Create one straight line from heels to head.

3. Press Heels Back
Draw your navel in, and bring shoulder blades together.

4. Inhale as You Bend Your Elbows.
Try to hover an inch above the floor.

5. Exhale and Push up to the Starting Position.
Repeat nine more times.