Elbows pull the head forward
Neck flexors are doing the work; the abdominals are underloaded.
Overactive muscles
SCMScalenesSuboccipitals
Corrective work
Foam RollSuboccipitals (lacrosse ball)↗StretchSCM / scalene stretch↗Neck flexors are doing the work; the abdominals are underloaded.
Hip flexors dominate above the C-curve; this is a Pilates chest lift not a sit-up.