Position yourself in push-up position with hands closer to your body in order to isolate your triceps. Twist a band over, creating an X, and wrap it around your back. Start by lying flat on your stomach with your hands just under your pecs. Push yourself up to a full arm extension.
Tips:
Point toes down to help maintain your balance.
Remove the band to lower resistance.
Variations:
Place knees on the ground and form a triangle between your torso, arms and the floor.
Position your hands closer together for a challenge.
Hold yourself up in a motionless position, with your body off the ground for an added challenge (static resistance training).