Well, I love to bike ride, so I do that on occasion, but my city is not very bike-friendly, so I can't do it at a pace that would be considered fat-burning.
For that, I'm lucky enough to have a gym-quality elliptical machine at home. Every day, I hop on it and go for at least an hour while I'm watching TV.
Jogging, running, or even walking don't agree with my knees yet, so I avoid those activities.
