Ok, lol, I know that's kind of a weird question. I jog/run for 2 and a half hours on my treadmill every evening (I know that sounds like alot, but I have alot of energy and like to jog), but I always have to fight with my sis' over who gets to use the treadmill when. Since we argue over equipment and I would like to try something new anyway, I was thinking about purchasing an indoor bike and start doing that instead. Will I get big thighs? I mean, I have muscular thighs right now, but they are subtle and not abnoxiously muscular. If i keep the bike on a low resistence, can I bike for a couple of hours a day withought getting massive leg muscles? Is it good cardiovascular like jogging is? Hope my question wasn't confusing..any suggestions or comments would be appreciated!