Try this no-equipment cardio and toning workout by the creator of the Animal Flow class at Equinox Fitness Clubs.
As you crouch to the ground, keep your butt as low as you can and place your hands in front of you, then jump reaching your hands overhead and quickly place your hands to the ground before returning to a standing position before your next rep. Do 2 sets of 12 reps. Starting in this crouch position reach your arms forward as far as you can then straighten your legs so that your upper body comes forward into a point position. You should feel like you're balancing on your tiptoes. At the same time, bring your knee to the outside of your elbow then return to the crouch position. Do 2 sets of 12 reps alternating legs. Pushing off your bent leg, move your body sideways by lifting both feet in the air then landing in front of your hands. To make this move easier, keep your body low and your feet on the ground and shuffle to the side. Do 6 reps, switch directions and repeat. Do 2 sets total. Balance on 1 leg and with the other knee forward then slowly squat on your balancing leg as you bring the bent leg behind you and your body hinges forward. When your back is parallel to the floor and your foot is in line with your back, return to standing. Place your hands on your hips to make this easier. Do 12 reps, switch sides and repeat. Do 2 sets total. Keep your butt lifted an inch or so off the floor throughout this entire move. As you arch your back, put your hand over your head as far as you can. Try to look at the floor behind you. Do 2 sets of 12 reps alternating sides. Beginning in this crouch position, make sure to keep your heels down and your feet flat on the ground. As you lift your torso and reach your arms out to the sides, come up on your heels until your back is flat. You should really feel this in your quads. Then return to a crouch position with your heels back on the ground and your hands stretched out between your legs. Do 2 sets of 12 reps.