Step 1: Lay down with your back flat on the ground, knees bent, and your feet flat on the ground as well.
Step 2: Lift your left foot off the ground and straighten your leg out so that your toes are pointing toward the ceiling.
Step 3: Lift your midsection up off the ground till your body makes a straight line from your shoulders to your right knee.
Step 4: Hold for a half second and then lower yourself back down.
Step 5: Repeat for the desired amount of reps and then switch legs and repeat.