I want to know if a stationary bike is a good cardio workout vs. running or jogging. I really like the ones at the gym but am not sure if I am doing enough work on them to make a difference. My legs burn, and I get out of breath, but I slow down until the burn goes away and it's only burning about half the time. I usually do about 5 miles on the bike. Will this help me lose weight just as effectively as running? Thanks!