. >> reporter: joe tucker's athletic achievements are written all over his wall. >> this is my wall ofe since 25 when a motorcycle accident took his left leg. wearing a prosthetic limb hasn't kept joe down. he's been through six legs and counting. >> this is one of my older legs you could say, more of the original technology, the technology is older, a little bit heavier. >> reporter: with the older models, climbing stairs and stepping over objects was challenging and practicing baseball drills with his kids was difficult. >> frustrating times where you want to teach them how to throw a ball, pitching or you want to teach them how to throw a ball, batting. i stand differently than they do. >> reporter: the new leg developed in part for the military for wounded soldiers promises to take them to new heights. joe is one of the first civilians to step out with the genium. >> put your foot over. >> reporter: and coaching him someone who has walked in his shoes, bill dunham, retired army sergeant, fellow amputee and user. >> going upstairs, step over step, showing know how to use that, inspi