i second that about the bike actually being work! last time i was going to the gym regularly (before the loss of free gym with college graduation ), i noticed a difference in my legs after just a couple of months - catching their reflection in storefronts, even! it definitely works my thighs, and calves if i'm going hard.
i can't tell, though, if it works my butt or if my butt is getting sore from the seat. (i do the bike with a chair back so i don't strain my hips, but how my butt is bony with the rest of me as i am i will never know.)
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Re: Treadmill IS easier
), i noticed a difference in my legs after just a couple of months - catching their reflection in storefronts, even! it definitely works my thighs, and calves if i'm going hard. 
