so I been excercising and dietng really hard. I been doing alot of cardio, running, hiking, and the eliptical. I guess what I'm getting at is my knee. it seems all the sports football, basketball and track and the years marching and airborne school in the army caught up. I can still walk but me knee is killing me it use to pop in and out of place but now it just swells up and fills with fluids and the pain has moved to behind my knee on the back of my leg . can I continue to tough it out and got for it to subside or should I not cycle