<s>[INST] Hi I am a full time gymnast! I train 14 hours a week for the past few weeks my knee has been bothering me. Not as much while doing activity more of after any type of running of pounding for example I had practice yesterday morning and I can now barley walk. What could be the problem [/INST] Hello and welcome to ‘Ask A Doctor’ service.  I have reviewed your query and here is my advice. Its possible that you could be undergoing knee fatigue and your rest periods between activities are long enough so your body is not recovering in time. Usually during activity, blood flow to active muscles and adrenaline happens, but during rest all that goes away and since your muscles and joints never recovered it exhibits signs of fatigue. I would recommend taking full day of rest and resuming to see if that helps. Also proper nutrition goes a long way. Hope I have answered your query. Let me know if I can assist you further.Regards, Dr. Samuel Parmar </s>