knees
If you’ve ever had knee pain, then you know how important the knees are for getting you where you need to go. Without a good balance of mobility and strength/control, you can be significantly limited in your ability to walk, run, squat, crouch, and go up/down the stairs.
Muscles prone to tightness:
Hamstrings
Quads (rectus femoris)
Muscles prone to weakness:
Quads
Vastis lateralis
Vastis medialis