I had the same problem and went exploring on Youtube. There are many ways to do a reverse crunch, but I found out that with this type, you don’t have necessarily to move your butt so high, just a little off the floor is just fine, and trust me it hurts the same, though it doesn’t involve cardio and super muscular strength to do it. I also keep my shoulders a little off the floor with my hands under my head so I don’t push the floor with my hands and it works different parts at the same time. Hope this helps !
Cat Kick: Stand with feet together, arms extended out like airplane wings. Exhale, and lift the right leg forward and up. At the same time, sweep the arms forward at shoulder level and round the spine, like a cat. The navel should feel as though it's pressing toward the spine. Inhale, and open back up and return to the starting position. Repeat with the left leg, alternating for 20 repetitions.
Kneel on the floor with your knees hip-width apart, toes tucked under. Extend your arms out straight in front of your chest, palms facing down. Lift your chest and press your pelvis forward as you hinge backwards, arching slightly through your lower back. Pause and focus on opening up your chest while also keeping your ribcage down and your belly button drawn into your spine. Slowly return to the starting position. That’s one rep. Repeat up to 10 times.
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