Lunge: Stand with feet hip-width apart, hands on hips or hold dumbbells. Step forward (or back, which is a rear lunge) with one leg and lower until front thigh is parallel to floor and knee is aligned over front ankle. Step back to start and repeat.

Mountain climbers: Get on hands (wrists aligned under shoulders) and toes so body is straight from head to heels. Lift hips slightly and bring right knee toward right elbow. Switch legs and repeat; try to hop legs back and forth.

Push-up: Position yourself facedown on hands and toes (or knees). Pull abs in and keep body aligned from head to heels (or knees). Bend elbows about 90 degrees and lower chest toward floor. Push up and repeat.

Plié squat: Stand with feet extra wide, toes turned out, and place hands on hips, hold dumbbells, or extend arms in front of you. Keeping chest high and abs tight, bend knees and lower hips until thighs are parallel with floor; keep knees aligned over toes. Stand up, squeezing glutes tight, and repeat.

Side shuffles: With knees bent in a half-squat and hands on hips or at sides for balance, step to the right with right foot and quickly bring left foot in to meet it. Continue across the floor.

Single-leg squat: Stand on one leg, other leg bent or extended in front of you (hold onto something stable for balance if necessary). With hands on hips, out in front of you, or holding dumbbells, bend balancing leg and lower into a squat, trying to keep knee from extending past toes. Rise up and repeat.