Step 1: Sit straight in your chair with both feet on the floor.
Step 2: Extend your right leg until it's level with your left knee.
Step 3: Keep the right leg straight and hold in place for 5-10 seconds.
Step 4: Lower the leg back to the ground.
Step 5: Repeat, alternating legs, for 15 reps.
Step 6: To make the exercise more challenging, loop your purse or briefcase strap over your ankle for added weight.