How Iridium Programs This

Iridium scans your 7-day workout history and per-muscle recovery status to ensure your erector spinae aren't too fatigued to safely stabilize this movement. Because this exercise is taxing, the AI tracks volume against your Maximum Recoverable Volume landmarks to prevent overtraining the posterior chain. RPE trends are monitored across sessions to determine when you need added resistance to maintain progressive overload.

Form Cues

Position your knees just behind the pad and secure ankles firmly
Drive your toes into the footplate to engage your calves and hamstrings
Squeeze your glutes to keep your hips fully extended throughout the rep
Lower your body under control until parallel to the floor
Pull yourself back up by driving your heels toward your glutes

Don't

Don't break at the hips or stick your butt out to initiate the ascent
Don't hyperextend your lower back at the top of the movement
Don't use momentum or swing your body to get up
Don't allow your knees to slide excessively forward on the pad

Common Mistakes

Breaking at the hips (hinging) instead of curling
Rushing the lowering (eccentric) phase
Overarching the lumbar spine
Setting the footplate too far back or forward

Muscles Worked

This exercise is a powerhouse for the posterior chain because it works the hamstrings at both the knee and hip joints simultaneously. It primarily builds mass and strength in the hamstrings and glutes, while the erector spinae and calves work isometrically to maintain a rigid, straight-body position.