Add a triceps extension to your plank with row to target the back of your upper arms.
- Start in a plank position holding a weight in each hand. Bend your left elbow and pull it up so it's in line with your shoulder.
- Pull your navel toward your spine to engage your abs, which will help you stay balanced.
- Exhale as you do a triceps kickback by extending your left hand behind you. Inhale to bend your elbow. This counts as one rep. Perform exercise on both sides of the body.