Weighted Sit Up: Do a normal sit up while holding a five-pound weight in each hand, reaching your arms straight past your knees. If you're stronger, keep the weights closer to your body, resting on your chest or held up near your forehead.
Spiderman Contractions: Start in a push-up position with your arms shoulder-width apart. Keeping your core tight and maintaining your form, bring your right leg up to your right hand, creating a lunge postion. Quickly and carefully move your right leg back to the plank position, keeping your body in a straight line. Repeat with the left foot.
Standing Knee Raises: Standing with your belly scooped in and your elbows behind your head, bring your right knee up, twisting your body to bring your opposite elbow to your knee. Think of it as doing bicycle sit-ups while standing!
Side Planks: With your bottom arm bent under you at 90 degrees, maintain your side plank for 30 seconds. Position your top arm on hip or straight up in air. You can add in variations for a further challenge, such as lowering and lifting the hips, or threading your top arm under and through bottom arm and then back to your starting placement.
Standing Oblique Crunches: Standing with legs in a 45 degree rotation, lift your arms up overhead like you are holding a beach ball. Draw your knee up into your armpit while the upper body does a side crunch towards the working leg. Return to starting position. Do 10-15 on each side.
Side Leg Lifts: Lay on your side with the legs slightly in front of the torso about 20 degrees. Lift and lower the top leg, keeping the leg parallel. Do this 15-20 times, and on the last rep, hold the leg at the top and pulse up for 10-20 reps.