Rolliig Airier: Wheelchair basketball celebrates 50 yearsHis name may not be as familiar as Magic Johnson s but Trooper Johnson s basketball stats are just as impressive He s averaging 29 oomts a game as 199 7's Most Valuable Player of the Nationa Wheelchair Basketball Association *^tcn begins its SOth season this ***+ IV 33 vear o*d s fitness ^gjnvr induo**.■ Pushing 10 miles a day on his wheelchair for shoulders and front muscles■ Weight training three days a wee* Wheelchjir bound oeopie *o»*v^iop front muscles faster, so its important to pay attention to back muscies too*■ Practicing on the basketball court for 30 mnutes to ? hours a da usm^ his S3.000 custom made chair, 'the Nike of wheelchairs*■ Cranking a hand cycle 30 minutes a day - ( eMir (» Soriano