Xliders: Two matching mini-skateboards with dual, fully pivoting wheels. Likes: Challenging, coordination-building and -- once you get the hang of it -- extremely cool. It's skateboard-meets-in-line skates. You propel yourself by wiggling your body and pumping your legs back and forth. The manufacturer's claims that Xliders help build a better athlete seem true; your whole body works hard just to maintain balance. Athletic types will love the maneuverability, the speed and the challenge. Dislikes: Not so easy to learn. The instability can be scary. Requires coordination, balance, guts and patience. Non-athletes and the uninsured will flee in fear. Price: $149.99. (800) 586-7872; www.jumpusa.com.
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