This Exercise Will Seriously Tone Your Arms (And It Doesn't Require Any Weights)

Push-ups are a do-anywhere, crush your upper body exercise.

Whether you do them on your toes or on your knees, you'll get a great upper-body strengthener that targets the chest, shoulders, forearms, and triceps depending on arm position and your core. I love them for their versatility and because you don't need much space or equipment to do them

1. Start in a full plank (legs straight) or modified plank (knees on the ground) position. Shoulders, elbows, and wrists stacked. Hands can be shoulder-width or slightly farther apart.

2. Bend your elbows behind you—not out to the sides in a "T" position—to lower the entire body (or from knees up) toward the ground. The whole body should lower together, not the chest without the hips or the hips without the chest.

3. Press straight back up to plank.