Sit on a folded towel on floor, lean back to rest on elbows and place feet together on a wall in front of you so that knees are bent about 90 degrees.
Extend legs up, keeping feet against wall, then press rounded lower back into floor and squeeze abs as you lift arms to reach toward feet, elbows soft. Make it harder: Press feet into wall as you reach.
Do 20 pulses: Curl torso up 1 inch, then lower 1 inch.
Do 3 sets, hugging knees to chest to rest between sets.
Targets: Lower back, rectus and transversus abdominis, obliques, and butt
Lie faceup on floor with back resting on folded towel, knees bent and feet flat on floor, arms by sides.
Cross right ankle onto left thigh just above knee so bent right knee points out to side; flex left foot so only heel rests on floor.
Rounding lower back and squeezing abs, lift hips off floor so pelvis tilts up toward ribs. Curl pelvis as far as you can without arching back; pull abs in to lift rather than press through left heel. Lower to floor.
Do 10 reps, holding the lift for 10 seconds on the final one. Switch sides and repeat. Do 3 sets.