3/4 sit-up

45° side bend

air bike

alternate heel touchers

assisted hanging knee raise with throw down

assisted hanging knee raise

assisted lying leg raise with lateral throw down

assisted lying leg raise with throw down

assisted motion russian twist

barbell press sit-up

3/4 sit-up

45° side bend

air bike

alternate heel touchers

balance board

bench dip (knees bent)

bench hip extension

body-up

bottoms-up

biceps narrow pull-ups