Start in a push-up position with your hands under your shoulders and your feet about hip-width apart. Lift one hand off the floor and tap the opposite shoulder, place it back down, then tap with the other hand. The goal is a torso so still that a cup of coffee on your lower back wouldn't spill - all the movement belongs to the tapping arm, none of it to your hips.

Works: shoulders, triceps, core, obliques

Breathing: Exhale as you tap, inhale as your hand returns to the floor.

Common Mistakes: Rocking the hips from side to side with every tap, shifting the weight back toward the feet, and rushing the taps so fast that control disappears entirely.

Make Easier: Widen your feet for a more stable base, or drop to your knees and tap from there.

Make Harder: Bring your feet together and slow every tap down, or move on to Plank Punches to extend the arm further from your base.