Lots of Snapping Tendons and Ligaments

Would anyone happen to know what could cause any of the listed snapping/clicking tendons or ligaments?

Hip Flexor: Sit-Ups, Leg Raises
Bottom of Shoulder Blade: bottom of Pull Up
Shoulder Joint: Lateral Raise
Outside Of Knee: 90 degree knee flexion during Hamstring Curl
Inside Of Knee: 30 degree during Squat
Inner Hamstring Tendon at knee: hamstring stretch with knee fully extended (also snapping between both hamstring tendons, not palpable).

Thanks,

AC