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

biceps pull-up

chest dip

chin-ups (narrow parallel grip)

circles knee stretch

clock push-up

close-grip push-up

cocoons

cross body crunch

crunch (hands overhead)

crunch floor

dead bug

decline crunch

decline push-up

decline sit-up