How Iridium Programs This

Iridium leverages the stability of the Smith machine to target the quadriceps and glutes with higher intensity than free-standing variations generally allow. The system tracks your weight and RPE to ensure progressive overload occurs through mechanical tension rather than just balance improvements. To prevent overtraining, Iridium balances the volume from this high-fatigue unilateral exercise against your Maximum Recoverable Volume and your 7-day training history.

Form Cues

Position the bar across your upper back and traps
Extend your non-working leg straight out in front of you
Lower your hips until your working thigh is at least parallel to the floor
Drive firmly through the heel of your working foot to stand up
Keep your chest lifted and core braced throughout the rep

Don't

Don't let your working knee collapse inward
Don't allow your working heel to lift off the floor
Don't round your lower back at the bottom of the movement
Don't drop into the bottom position without control
Don't rely on the non-working leg for assistance unless necessary

Common Mistakes

Knee valgus (caving inward)
Lifting the heel off the ground
Rounding the lumbar spine (butt wink)
Insufficient squat depth
Rushing the eccentric (lowering) phase

Muscles Worked

This exercise primarily isolates the quadriceps and gluteus maximus, placing a heavy load on one leg at a time to build unilateral strength and muscle mass. It also engages the hamstrings and core stabilizers to maintain an upright torso against the resistance of the fixed bar path.