HOW:Place your forearms on the ground with your elbows straight under your shoulders, your knees straight down from your hips. Push into the ground with your toes and lift your knees off of the ground. From this position, kick one leg straight back from your hip. Bring it back to the starting position and repeat.
FEEL: You should feel you glute muscles working on the leg that is lifting. You will also feel your quadriceps muscles working on the knee that is holding you up. You should also feel your core working.
COMPENSATION: Don’t twist your back as you kick your leg out. Keep your leg straight out from your hip, not above it.