Ab Crunch Machine
The Ab Crunch Machine is a resistance-based exercise that isolates the abdominal muscles through controlled spinal flexion. It allows for safe, adjustable loading to build core strength and definition while minimizing lower back strain.
Since this machine allows for precise loading, Iridium calculates a 1RM estimate for your abdominals and applies progressive overload logic based on weight trends rather than just rep count. The AI tracks your RPE per set to ensure you accumulate effective volume for the upper abs without exceeding your Maximum Recoverable Volume for the core.
Form Cues
- Exhale deeply as you crunch forward to maximize contraction
- Keep your lower back pressed firmly against the seat support
- Initiate the movement specifically with your abs
- Control the return phase slowly to keep tension on the muscles
- Don't pull the handles down using your arm strength
- Don't let the weight stack slam down between repetitions
- Don't hold your breath during the crunch
- Don't use momentum to jerk your torso forward
Common Mistakes
- Pulling with arms instead of abs
- Using excessive momentum
- Lifting hips off the seat
- Performing reps too quickly
- Incomplete range of motion
Muscles Worked
This exercise primarily targets the rectus abdominis, effectively isolating the 'six-pack' muscles through loaded spinal flexion. It also engages the external obliques to a lesser degree to assist in stabilizing the torso throughout the movement range.
Primary
Secondary
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