decline weighted crunch.
this can be done while holding a medicine ball, a dumbbell, a plate or even no weight at all.
latch your feet into a decline bench and sit upright:
next, lean back as far as you can~ make sure to hold the weight over your chest and you keep your abs flexed the whole time.
come back up to the starting position (first photo) and make sure you are using your abs to bring you up, not your legs, neck or any other part of your body! you really need to engage your abdominal muscles for this one so it works for you!
i like to do 3 sets of 20 reps.