Lay on your back, with your hands anchored behind your head.
Engage your lats & core by actively pulling with your arms, elbows forwards.
Raise your legs off the floor - Keep them as low as you can while maintaining Core tension - lower back should remain in contact with the floor.
Generate tension throughout the whole body and hold for time. (Rest any time the form breaks down)
Raise your legs by utilising your core & lats. Allow your lower back to lift at the top of the movement, shifting your weight to the upper back.
Lower with control, maintaining PPT (Tuck tailbone, do not allow the back to arch)
Exhale on the way down. Do not let your legs drop at the bottom - keep tension on the core Repeat for repetitions.