Answer:
Bent-Knee Hip Raise. Major Muscle Group: Rectus abdominus This is like a reverse crunch but with a longer range of motion.
Step-by-step explanation:
As mentioned, the Ab Crunch Machine mainly trains you with the straight abdominal muscle. This muscle pulls the sternum towards the pelvis, by bulbing the back. The transverse abdominal muscles help. They pull the abdominal wall backwards and stabilize the core in this way.