Exercise Moves to Tone Your Butt, Thighs, and Legs - The Chair Twist
How to do it: Start by standing with feet together. Bend the knees and push the hips back, while making sure the knees stay behind the toes. Lower the thighs until they’re almost parallel with the floor and raise the arms forward and up. Then, rotate the torso to the right side and place the left elbow on the outside of the right knee. Hold for 3 breaths and return to the starting position.
Repeat on the left side to complete one rep; do 3 reps.
This move works the butt and legs, and though chair is in the title, no equipment or props are needed. (source)