This machine is named Abdominal Crunch Coaster for a reason because it's shaped like a roller coaster rails where it bends in smooth angle so that you can raise and bring your knees up towards your abs without moving your back, which doesn't stress your lower back.
This machine is named Abdominal Crunch Coaster for a reason because it's shaped like a roller coaster rails where it bends in smooth angle so that you can raise and bring your knees up towards your abs without moving your back, which doesn't stress your lower back.
