Big Wheels Profit from: cabinet refacing, health products, kids' fitness.

A big yellow school bus is hardly the place you'd expect tosee students performing cartwheels and somersaults, but childrenare flipping for the mobile gym known as "Tumblebus." Theidea of a bus filled with ropes, rings, vaults and beams soundsstrange? Perhaps, but Tumblebus has successfully parked its programin day-care and elementary school lots since 1987.

Tumblebus operators, whose mobile gyms are loaded with brightlycolored physical education equipment, offer 30-minute work-outsthat teach children basic motor skills. Classes can be held atday-care centers and elementary schools, as well as birthdayparties and other special occasions. Using weekly lesson plans thatincorporate Disney themes and children's music, Tumblebusinstructors set up activity stations so students move from onepiece of equipment to the next.

"[Schools and day-care centers] like it because they canoffer parents outside activities that actually come to theircenter," says Tumblebus operations manager Larry Scharlow."And, of course, the kids love the concept."