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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.
Abdominal Crunch Coaster Fitness Gym Equipment.
KSh48,299 -
A curved treadmill is a non-motorized, concave device that allows users to walk and run on it with each foot strike propelling the belt behind them.
Curved Manual Runner Treadmill.
KSh441,599