Even up north it gets pretty hot during the summer and spring, hot enough that you would be a sweaty mess I would think after biking to work. When I was in the Navy a few guys would do that but we had showers at work and a very lax policy about being on time when it came to working out. I commute 36 miles per day, also, and that doesn't count when I have to go to school which adds probably another 30 or so miles on. I don't ride bikes but that seems like a really long daily bike ride.
I really think that the overwhelming major cause of this obesity shit is diet. When I got fat, I didn't give a shit what I ate. I wasn't eating pizza rolls like chips yet or anything, but everyone has to bow at the feet of the master. A guy I know at work who is just fucking obscenely obese, he eats bullshit every day. Doughnuts, pop tarts, chips, fast food, soda, candy, etc. EVERY DAY. Dude one day bought a 12 pack of tacos from Taco Bell and ate that shit himself, in one meal, then ate again later. We go out to get food for lunch or something, this guy orders a meal and then another meal. We went to this sandwich place and he orders a sandwich, chips, a soda, and a salad. I explained to him the salad was a meal and he just says "I know." The other night, he is drinking a smoothie along with his meal. I explain to him that a smoothie is a meal replacement, not a fucking water replacement, he just doesn't care. He gets pissed when we criticize him but the dude is killing himself. Some men just want to watch the world burn.