
Grab a long resistance band and tie its ends together to form a long loop. Securely attach one end of the loop to a sturdy object.
Loop the other end of the exercise band, stand with the exercise band behind the knee of your affected leg a bit above the joint line.
Slightly bend your knee a bit against the band to release the muscle in the back of your thigh called biceps femoris. Be sure to avoid letting your knee go too far.
Then, push your affected knee back against the resistance band.
Hold for about 5 seconds, then go back to the starting position with your knee slightly bent.
Relax and repeat the above steps at least ten times.