How Iridium Programs This

Iridium uses sub-muscle-group fatigue awareness to suggest this exercise specifically when the short head of the biceps needs volume but the long head or shoulders are fatigued. The algorithm monitors RPE trends to guide progressive overload in moderate-to-high rep ranges rather than prioritizing heavy 1RM strength estimates. This allows Iridium to precisely top off your weekly Maximum Adaptive Volume for the biceps without impacting recovery for larger compound pulling movements.

Form Cues

Sit with your legs wide and feet planted firmly on the ground.
Brace the back of your tricep against your inner thigh, not on top of the knee.
Fully extend the arm at the bottom to maximize the stretch.
Squeeze the bicep hard at the top of the movement.
Keep your torso still and lean slightly forward over the working arm.

Don't

Don't swing your upper body to generate momentum.
Don't let your elbow slide up or down your thigh during the rep.
Don't curl your wrist inward excessively at the top.
Don't stop short of full extension at the bottom.

Common Mistakes

Placing the elbow on top of the knee
Using momentum to swing the weight up
Shortening the range of motion
Lifting the shoulder to help pull
Curling the wrist to compensate for weak biceps

Muscles Worked

This exercise primarily targets the short head of the biceps brachii, which is responsible for the height or 'peak' of the bicep when flexed. By fixing the arm against the leg, it removes the ability of the anterior deltoid to assist, ensuring the biceps and secondary forearm muscles handle the entire load.