45° Leg Press (Machine)
The 45° Leg Press is a machine-based compound exercise that builds lower body strength by pushing a weighted sled upwards at a 45-degree angle. It primarily targets the quadriceps, glutes, and hamstrings while minimizing stabilization demands on the lower back compared to free-weight squats.
The stability of the 45° Leg Press allows Iridium to prescribe higher RPE sets closer to failure than would be safe with free-weight squats. If your 7-day history indicates recent heavy spinal loading, the AI prioritizes this movement to drive quadriceps volume without further taxing your lower back. Your progress is tracked via RPE and weight trends to ensure you stay within your Minimum Effective Volume while still forcing adaptation.
Form Cues
- Place your feet shoulder-width apart on the platform
- Keep your lower back and glutes firmly pressed against the seat pad
- Lower the sled slowly until your knees form a 90-degree angle
- Drive through your heels to push the weight back up
- Keep your knees aligned with your toes throughout the movement
- Don't lock your knees out at the top of the movement
- Don't let your lower back round or lift off the pad
- Don't allow your knees to cave inward
- Don't place your hands on your knees to assist the push
- Don't let the weight drop quickly without control
Common Mistakes
- Locking knees at full extension
- Lifting hips off the seat (butt wink)
- Using a partial range of motion
- Pushing with hands on knees
- Letting knees collapse inward
Muscles Worked
This exercise is a powerhouse for the quadriceps, effectively isolating them due to the fixed path of motion. It also heavily recruits the gluteus maximus and hamstrings to extend the hip, providing comprehensive lower body development with reduced spinal loading compared to standing squats.
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