Image: Justin Steele
Purpose: Challenges abs through a full range of motion
Sit on the floor, knees bent with soles of feet together and toes touching baseboard of a wall. Place a folded towel on the floor behind you, positioned under your lumbar spine when you lie back. (Back bothering you? 4 Moves That Heal Back Pain) Extend arms straight so fingertips touch the wall and, keeping your back straight, lie back until your shoulder blades touch the ground. Sit back up immediately and touch your fingertips to the wall. Repeat 10 to 20 times.
Build on It: Aim for 50.