Have someone take a look at walking, running movement patterns.
Improving these can help.
Satorius, biceps femoris, semitendinosus and semimembranosus.
Interacts with rectus femoris, satoris
Knee Pain? Got Full Knee Power/Range of Motion/Potential–Terminal Knee Extension Part 1
Knee Pain? Got Full Knee Power/Range of Motion/Potential–Terminal Knee Extension Part 2
Knee Pain? Got Full Knee Power/Range of Motion/Potential–Terminal Knee Extension Part 2