Ab Crunch
Comprehensive biomechanics and technique cues to execute Ab Crunch with joint safety, maximal activation of the Upper Abs, and consistent progression.
Track sets and weights on eBolts
Automated rest timer, 1kg micro-loads, and offline functionality in the gym.
Execution Guide: Biomechanical Steps
Initial Setup and Positioning
Set up a stable body base, keeping feet firmly planted and upright posture.
Joint Lock and Posture
Maintain a controlled pelvic position, activating deep abdominal muscles without straining the lower back.
Concentric Execution and Muscle Focus
Initiate the concentric contraction targeting the Upper Abs, moving the load smoothly without jerky momentum. eBolts technical cue: Slightly rotate the elbows on each side; squeeze the upper abs at the top.
Eccentric Control and Breathing
Control the eccentric descent in 2 to 3 seconds, sustaining continuous muscular tension. Inhale during lowering and exhale on peak effort.
Coach Technique Cue
Slightly rotate the elbows on each side; squeeze the upper abs at the top.
Equipment Alternatives
Dumbbells with a neutral grip, same range of motion and controlled tempo.
Medium-tension band anchored to a firm point, keeping tension at the end of the movement.
Bodyweight variation with a 1s pause at the contraction.
Equivalent machine or convergent leverage machine at the gym.