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

How Iridium Programs This

Iridium accounts for the high hip flexor demand in flutter kicks by checking your per-muscle recovery status to ensure this exercise does not interfere with recovery from heavy lower body sessions. Since this is a bodyweight movement, the AI tracks your RPE trends to drive progressive overload by incrementally increasing rep volume rather than adding external weight.

Form Cues

Press your lower back firmly into the floor to engage your deep core
Keep your legs straight and toes pointed throughout the movement
Brace your abs as if someone is about to punch your stomach
Breathe rhythmically and continuously, avoiding holding your breath
Place your hands under your glutes if you need extra lower back support

Don't

Don't allow your lower back to arch or lift off the floor
Don't bend your knees significantly; keep the movement at the hips
Don't lift your legs too high; keep the range of motion small and controlled
Don't hold your breath while kicking
Don't crane your neck forward if lifting your head

Common Mistakes

Arching the lower back off the mat
Bending the knees excessively
Lifting legs too high, reducing core tension
Straining the neck by pulling with the head
Holding breath during exertion

Muscles Worked

This exercise intensely targets the lower portion of the rectus abdominis and the deep transverse abdominis by demanding constant pelvic stability against the weight of your moving legs. Your hip flexors also work significantly to lift and lower the legs, making this a dual-purpose movement for core strength and hip endurance.