Hips pike up — not a straight plank
Core fails under the elevated feet; body jackknifes.
Overactive muscles
Hip flexorsLatissimus dorsi
Corrective work
Foam RollHip flexors↗StretchHalf-kneeling hip flexor stretch↗Core fails under the elevated feet; body jackknifes.
Cervical spine takes load; the push-up plane is incorrect.