Butterfly sit-ups, V-sits, weighted sit-ups ... Here’s a sit-up variation that will blast your abs and work muscles across your entire body. Below, I cover what happened when I totaled 350 ...

When it comes to performing sit-up exercises, the main muscles used are the rectus abdominis, obliques, transverse abdominis, and hip flexors. "The specific muscles that are worked and utilized ...

To help you stabilize your spine and pelvis, give your posture a boost, and help you move efficiently, Beckstrand has come up ...