Skater Start in modified side plank position on extended right arm. For support, bend left knee at 90 degrees and keep foot flat on ground. Lift hips and squeeze left glute so body is balanced on right palm and left foot. Keep right leg extended slightly in front of you, with foot resting on ground and left arm reaching toward sky.  Bring left elbow and right knee toward each other and hinge at waist into tucked position. Return to modified side plank and repeat, alternating between side plank and tuck. Do 10 reps on each side. Flying Passé Start in side plank position on an extended left arm, with hips and legs stacked, right foot foot flat on ground, and right hand on hip. Bend left knee so left foot taps right inner thigh (near knee). Slowly extend left leg behind you and rotate hips so navel faces ground. Bring left foot to tap right inner thigh again as you rotate back to side plank, without touching left foot down. Do 10 reps on each side. (Want more planks? Try these planks for every trouble spot.) Slingshot Start in plank with feet together and hands flat on ground, or one hand on medicine ball (medicine ball is optional for an advanced workout). Keeping ball in place, pull shoulders back, bend knees and drive butt toward ceiling. Quickly return to start position and hold 2 counts. Do 10 reps. MORE: 9 Proven Ways To Lose Stubborn Belly Fat Reverse V Dip Sit on floor, legs extended, feet placed on edge of sturdy chair, seat, or ottoman. Walk hands back until butt lifts off floor, keeping elbows slightly bent and fingers pointing toward chair. Slowly lower hips (without bending elbows) until butt almost touches floor. Pause, then return to starting position. Do 15 reps. Heel Click Place hands on floor, shoulder-width apart with fingers splayed. Walk feet backwards and slightly wider than shoulder width (almost in plank formation). In one explosive movement, push off feet and launch legs into air, clicking heels together at top of move. Land in starting position. Do 15 reps. MORE: The 8 Most Effective Exercises For Weight Loss Inverted Shoulder Dip Place hands on floor, shoulder-width apart, and walk feet back to narrow Downward-Facing Dog. Bend left knee 90 degrees, and lift onto toes of right foot. Bend elbows and lower upper body to floor. Pause, then return to starting position. Do 10 reps; switch legs and repeat.