(Difficulty: Beginner)
Description:
Sit in a chair or on the edge of a couch with your feet on the floor or dangling off the edge.
Straighten one leg, locking out your knee at the top. Think about squeezing all the muscles on the front of your thigh.
Control the movement to lower your foot back to the floor, then repeat on the opposite side.
Complete 10 reps on each side.