Crunch kicks is also a good one. Lie on your back with your arms at your sides for support. Bring your knees in toward your chest as you pull your belly button toward the ground and keep your lower back glued to the floor. Try to maintain as much of this core engagement as you can as you kick your feet straight out in front of you. Don't allow your lower back to arch off the floor. If your back arches a lot, don't kick as far or try the modification below. Repeat, repeat, repeat until you get your reps done.
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