I am wanting to get a bike to do some cardio, i am kind of lazy so i want to be able to do it in front of the tv so i can watch a movie and do the cardio for a hour in a half. i was going to get a exercise bike but then i thought about it and is there a difference if i would get a real bike and one of those things that keep it from moving. the only difference i could think of was, with the Exercise bike i could monitor heart rate, calories burned and increase intensity but with the real bike i could take it out side if i wanted to ride outside. any thoughts on this topic, either which to pick or other pros and cons.