plank kicks -- hold a plank position for a 5 count, then lift one leg slightly up and hold for kick it out to your side and hold for then bring it back in and hold for 5 before dropping it back down to the ground. repeat for each side.
cinch it -- in a plank position slowly rotate your hips side to side while keeping your shoulders in line above your elbows on the mat. be sure to touch your hip on the ground before changing direction!
cat crunch - in a plank position, begin with arching your back and pulling your knee towards your face while contracting your abs. fully extend your leg back, using both your abs and your low back moving as slowly as possible.
knee up crossover -- standing with one hand pressed above you, and the other one to your side (dumbbells in hand) twist to one side, lifting that knee up while bringing your elbow down to meet in front of you. return to standing and repeat.