Suffering from slight knee problems. Please help?

For a while now, my left knee has been quite pathetic. My right isn't great either. My left knee pops (makes a popping sound) a lot but I've been told it's due to the build up of gases. I really want to strengthen my knees for football/soccer. After a while of playing, my knee has some weird... show more For a while now, my left knee has been quite pathetic. My right isn't great either. My left knee pops (makes a popping sound) a lot but I've been told it's due to the build up of gases. I really want to strengthen my knees for football/soccer. After a while of playing, my knee has some weird "pain". It's not really pain it's as if it goes stiff a little and I can't really run. So my questions are, does this seem serious enough to warrant a trip to the doctor and what exercises would help increase the strength of my knees? Even though they are a joint.
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