Today I learned a lot about knee. Doctor Ahmad taught me about the structure of knee: the bones and the muscles that move the knee joint. He told me about harmstring, quadriceps, patela, tibia and the rest that I can’t remember. Here’s some picture from internet:

picture above is about harmstring, the next one is about quadriceps

the problem comes when the unbalanced power exist between those muscle…
ah, so difficult lah ya!!?