STARTING POSITION:
Sit on the floor and grab the unaffected knee, extending the other one in front of you. Contract your pelvic floor and core while keeping your chest up.
MOVEMENT:
Slightly raise your extended leg maintaining the knee extended. Repeat the movement for the specified amount of repetitions and then switch sides and repeat with the other foot.
TIPS: The exercise key is quality over quantity. The trick is to perform the exercise using proper form.