HOW: Begin by lying on your back with a band around your feet. Bring both knees up to where they are straight up from your hips. Keep one leg there as you kick one leg out against the resistance of the band. Alternate kicking out each leg and returning for the prescribed amount of reps.
FEEL: You should feel your hip and core muscles working.
COMPENSATION: Keep your knee straight up from your hip as you kick the other down, don’t let it drop.