When I was young I naturally had plenty of exercise. It helped that my parents didn't bother to drive me most of the time and there were no buses to my junior high or high school, so I did a lot of walking (high school was well over a mile each way). That included walking through the blinding snow-storms we regularly got in Newfoundland. Even in college and grad school I was mostly car-less; I'd get occasional rides from strangers when they saw me walking home with bags of groceries (in the rain I looked particularly pathetic, I guess), but mostly it was walk, walk walk. Or sometimes take a city bus. I'd occasionally take my bike out for long rides in the hills around Ithaca.