Exercise movement reviewed by:Marie Braga, PT, DPT, CSCS

How Iridium Programs This

Iridium tracks performance relative to your body weight and uses RPE trends to signal when repetition volume must increase to maintain an effective stimulus for the Upper Abs. The system analyzes your 7-day workout history and per-muscle recovery status to ensure core fatigue does not accumulate immediately before heavy compound sessions that require stability. If your training methodology prioritizes core endurance, Iridium adjusts set volume to fit your available time constraints while respecting recovery limits.

Form Cues

Press your lower back firmly into the floor throughout the set
Exhale sharply as you curl your shoulder blades off the ground
Imagine holding an apple between your chin and chest to protect your neck
Squeeze your abs at the top of the movement for a one-second pause
Lower your torso slowly to maintain constant tension

Don't

Don't pull on your head or neck with your hands
Don't lift your lower back off the floor
Don't use momentum to swing your torso upward
Don't tuck your chin completely into your chest
Don't hold your breath during the contraction

Common Mistakes

Yanking on the neck
Lifting the lower back
Using hip momentum
Limited range of motion
Rushing the lowering phase

Muscles Worked

This exercise primarily targets the rectus abdominis, specifically emphasizing the upper region, by flexing the thoracic spine against gravity. Unlike full sit-ups, crunches minimize hip flexor involvement, keeping the metabolic stress and tension focused purely on the abdominal wall.