Ok. I've been thinking about getting some type of cardio equipment for home. Running in 10 degrees sucks (not to mention rain/snow). Also, I'm a stay at home dad, so I figure I could fit in some cardio while my baby's napping. I was leaning towards a recumbnant bike. Figured it would be easy on the knees, etc. I went shopping today, and didn't really like them after trying them out. They just didn't feel right on my knees/legs. It was like I was either hyperextending/locking out my knees, or I was keeping my knees overly bent. Then I checked out elyptical machines. I'm not sure about these. They seem ok, but really put the burn in my quads. Treadmills are out of the question. The wife will probably use the machine too, and she doesn't like treadmills. We had one for years that doubled as a coat rack. Any input on the type of equipment that would be best suited for bjj/mma?? I'm looking to spend less then $500. Possibly maybe less then $400. Also, I'm just starting out in BJJ, so my conditioning is lacking.