It’s called a Cross Trainer, you see, because you can hop, skip, and jump with this CD player strapped into your ass pack and your music won’t hop, skip, or jump. In fact, the Electronic Anti-Shock System on the Aiwa XP-SP1200 gives you a 40-second buffer against such disturbances; the rubber gaskets mean you can keep sand off your Chumbawamba and Joni Mitchell when you bring them to the beach. $179.95 (with headphones)/Call 800-buy-aiwa for retailers.