Lay on your back and with your hands anchored behind your head.
Actively pull with your arms, elbows forward, contract your glutes - The whole body should be engaged.
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.