How Iridium Programs This

Iridium categorizes the TRX Bodysaw as a high-demand anti-extension movement that places significant static load on the anterior delts. The algorithm scans your 7-day workout history to ensure your shoulders aren't pre-exhausted from recent pressing, which would compromise your stability during the exercise. If your sub-muscle-group fatigue scores indicate your delts are the limiting factor, Iridium will substitute a core exercise with less upper body involvement to keep the focus on your abs.

Form Cues

Start in a forearm plank with feet secured in the TRX cradles.
Brace your core tightly as if preparing for a punch.
Squeeze your glutes to maintain a neutral pelvic position.
Slide your body backward slowly by pushing through your forearms.
Pull your body forward to the start position using your lats and abs.

Don't

Don't allow your lower back to sag or arch as you slide back.
Don't hike your hips up toward the ceiling to initiate the return.
Don't hold your breath; exhale forcibly as you pull forward.
Don't slide back further than you can control with perfect tension.

Common Mistakes

Hyperextending the lumbar spine
Using momentum to rock back and forth
Piking the hips to return
Looking up and straining the neck
Disengaging glutes during movement

Muscles Worked

This exercise primarily targets the rectus abdominis and transverse abdominis by forcing them to resist spinal extension as the lever arm lengthens. It also heavily engages the anterior deltoids and serratus anterior to control the upper body movement, while the glutes and erector spinae work isometrically to stabilize the pelvis and spine.