1
Sit upright on the ab crunch machine with feet firmly planted on the footrest. Grasp the handles with both hands at shoulder height, keeping elbows at roughly 90 degrees. Ensure your back is against the backrest for stability.
2
Position hands on the handles with a neutral to slightly supinated grip. Keep elbows tucked close to your body and stationary throughout the movement. Engage your core for stability.
3
Slowly extend both arms forward and downward, straightening the elbows while controlling the weight. Lower until arms are nearly fully extended but maintain a slight bend at the elbow to prevent joint stress. This lengthening phase should take 2-3 seconds.
4
Reverse the movement by flexing the elbows and pulling the handles back toward your body. Contract the biceps powerfully to curl the weight upward and inward. Return to the starting position with control over 1-2 seconds while maintaining constant tension.