From Spring Oxygen...
Do 3 sets of 30 for each...
Twisting bench crunch:
Lying on the floor, place your lower legs on top of a flat bench. Position your supine body so that your upper legs (above knee) are vertical- calves are on bench with feet hanging off other side. Place hands behind head. Curl upper body up by flexing your abs (no jerking up). As your shoulders lift off the bloor, twist to the left, lower and repeat the crunch, twisting next to the right. Alterniate twists until your set is complete.
Toes to ceiling:
Lie on a bench (longwise along the bench), holding the bench behind your head for stability (head is on bench as is butt). Put your legs up pointed -toes will point too -so that they are entirely vertical. Keeping your legs vertical, raise your butt off the bench 5-6". Lower and repeat. There is no need to lift your butt way up so that your whole torso is lifted off the bench.
Reverse crunch:
Let on your back on a flat bench (as above), holding bench behind head. Start wtih toes just touching floor and keeping knees bent throughout, raise both legs simultaneously until your butt lifts off the bench. Lower and repeat. Pic shows butt off bench, rolling forward until just upper back in in contact wtih bench so it is not a small move. Above move is much smaller.
Knee tuck:
Sit on edge of a flat bench (on side of bench, not end). Place both hands behind butt, holding on to edge of bench. Lean back for balance, putting legs straight out front. Draw your bent knees in to your chest. Push out and repeat until the set is complete. Keep your feet together and abs contracted as you pull your knees in toward you.