snow snow athletes flock to terry craig from our sister station has the story from fairmount park. >> reporter: it was the ultimate test. a one mile swim and in the schuykill river a quick change then a 25 mile scene nick bike ride followed up with a six mile run to the finish. >> organized play for adult you have to have all your gear. >> reporter: the 12th annual trirock triathlon is very organized with lifeguards and medical personnel near by so that the three thousand athletes can stay safe while focussing on the challenge. >> we could barely even swim 25 yards. and now we can swim the full mile. >> reporter: lisa and brian spent four months swimming bribinging and running they lost weight strengthening their bodies and their bond. >> we've been able to spend time together training otherwise we wouldn't have. >> reporter: what is clear the swim, bike, run challenge takes heart. >> what goes through your mind to keep you going. >> got to finish p got to finish. >> reporter: got to finish attitude and a little help. in addition to giving participants opportunity to train and have fu