Quick and Easy Ballet-Barre Workout
(A) Lie on your back on the floor (or a yoga mat), with your knees bent and your feet flat on the floor. Step your feet apart as wide as possible. Rest your arms on the floor at your sides.
(B) Press your rib cage into the floor, squeeze your glutes, and tilt your torso to raise your seat about five inches off the floor. Lower back down to the starting position. Repeat for three minutes, varying your speed from medium-fast to fast.