Exercise movement reviewed by:Cody Lockling, MS, CSCS

How Iridium Programs This

Iridium accounts for the heavy spinal loading of low bar squats by referencing your recent erector spinae volume and general recovery score before assigning heavy loads. The system tracks a specific 1RM for this variation, using RPE data to regulate progressive overload distinct from your high bar or front squat performance. If your 7-day history indicates accumulated fatigue, Iridium adjusts set volume downward to keep you within your Maximum Recoverable Volume.

Form Cues

Rest the bar on your rear deltoids, creating a 'shelf' with your muscles
Pull the bar down into your back to engage your lats
Drive your hips back and push knees out simultaneously
Keep your spine neutral and eyes focused a few feet forward
Drive up through your midfoot while maintaining a rigid torso angle

Don't

Don't let the bar rest high on your neck
Don't let your knees cave inward as you push up
Don't look straight up at the ceiling
Don't round your lower back at the bottom of the squat
Don't lift your heels off the floor

Common Mistakes

Placing the bar too high (high bar position)
Knee valgus (knees collapsing inward)
Butt wink (rounding the lumbar spine)
Leading with the chest instead of the hips
Failing to reach parallel depth

Muscles Worked

This variation shifts the center of gravity, placing a greater emphasis on the posterior chain—specifically the glutes and hamstrings—compared to the high bar squat. While the quadriceps are still heavily involved in knee extension, the forward torso lean recruits the erector spinae and core significantly to maintain a rigid, neutral spine under heavy loads.