This week's workout comes from Ami at Lifetime Athletic Club, which incorporates a ball into a barre class.

Place the ball in between your thighs and squeeze. Place both hands on the bar and sit back into a squat position. While in that position, squeeze the ball with your inner thighs. If you want to take it up a notch, sit deeper into the ground and repeat, as you come back up, make sure to squeeze the ball again.

For a glute exercise, place the ball behind your knee. Grab the barre and lean into it. Lift your leg, and pulse up while squeezing the ball. Don't forget to switch sides.