Your stomach muscles do the work of lifting and lowering both legs while you lie flat on your back.
Lie on your back on the floor, legs straight and hands flat under your hips. Lift your legs together until they point at the ceiling. Lower them slowly, stopping just before your heels touch the floor.
Keep your lower back pressed down. Bend your knees a little if your back starts to arch.
The long muscle down the front of your stomach (your six-pack). It curls your ribcage toward your hips and, with the deeper core muscles beneath it, braces your trunk to keep your spine steady.
The deep muscles linking your lower spine and pelvis to the top of your thigh bone. They lift your knee toward your chest as you walk, run or climb, and can feel tight after long hours of sitting.
No equipment required.
Strength: Builds muscle and strength with controlled, resisted movement.
Beginner: One new pattern or machine to learn, with light loads and low risk.
Bilateral: Each rep engages both sides of the body simultaneously.
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