Next time you're on vacation in Brazil you won't have to forgo your exercise regimen. Just hop aboard the Bus Bike (55-21/ 2490-2257; www.busbike.com.br; $30 per ride), a mobile gym that rolls along Rio de Janeiro's beaches, parks, and gardens. Literally a spin class on wheels, the bus has replaced regular straphangers with beautiful passengers who spin on stationary bikes to beats ranging from bossa nova to hip-hop. You start and end at the same point, while Rio scrolls past the windows, but you'll feel like you've run a marathon.
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