How Iridium Programs This

Iridium processes this exercise as a bodyweight movement, scaling your repetition targets based on your performance relative to your current body weight to ensure consistent progression. The programming logic accounts for sub-muscle-group fatigue by balancing this upper-ab focused flexion against recent lower ab or rotational work found in your 7-day history. If your RPE indicates the movement helps you hit landmark volume targets without excessive systemic fatigue, Iridium will prioritize it for high-volume finishing sets.

Form Cues

Lie flat with your lower back pressed firmly into the floor
Extend your legs vertically towards the ceiling
Exhale sharply as you lift your shoulder blades off the ground
Reach your fingertips towards your toes or shoelaces
Control the descent by lowering your upper body slowly

Don't

Don't pull on your neck or head with your hands
Don't let your lower back arch off the floor
Don't use momentum or swing your arms to generate lift
Don't hold your breath during the contraction
Don't bend your knees excessively unless flexibility requires it

Common Mistakes

Jerking the neck forward
Using arm momentum
Arching the lower back
Holding breath
Dropping torso too quickly

Muscles Worked

This exercise primarily isolates the rectus abdominis, specifically the upper region, by flexing the spine to lift the shoulder blades against gravity. The secondary engagement of the lower abs and hip flexors is required to maintain the vertical leg position, which also aids in flattening the lumbar spine against the floor.