you know, those grueling, swim- bike-run events that cover 140.6 miles. what about you, are you a competitive guy? >> yeah. >> reporter: kyle has cerebral palsy, no use of his arms or legs. to from the earliest age, i wanted kyle to be included in whatever he did. it's like okay, let's just hgure this out. >> reporter: he always look out for you? >> he was always there for me. maybe a little bit too much at times. because i'm very independent. >> reporter: good big brother. >> great big brother. >> reporter: kyle got the idea watching brent race in his first ironman in 2010. they found the right equipment, started training, and made it happen for kyle, just as when they were kids. >> kyle uses my legs and i use his spirit, so i pull kyle in the boat and i push the pedals on the bike and i push him on the run, but that whole time, lfle has spastic quadraplegia, so his body is fighting itself.