The Cobra works your core, triceps, and back. Do 8 to 10 reps.
-The Cobra: Lie face down on the floor with your palms near your chest. Lift your head, shoulders, and chest off the floor, pulling your shoulder blades down and together. Hold here for 2 counts and then lower back down. Repeat this 8 to 10 times. The Cobra works your core, triceps, and back. For a more difficult exercise, try lifting your thighs and hips off the floor.