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Not sure what is wrong with your knee but knee pain/dysfunction is usually caused by imbalances in the ankle and/or hip. Seeing a physio, sports massage therapist or osteo will help to work out what the problem is and then give you suitable exercises to strengthen areas of imbalance. It could entail glute strengthening on both sides or one side or one leg deadlifts etc. Hope that helps.
what body weight exercises helped your knee, looking to do some out in the park I dont really like indoor gyms that much..