was he involved in any sports ?
Yes, boxing
Roy Scheider
boxing 
where did the shark in jaws 2 come from The Cable Junction Island which was drifting towards Cuba what is the movie about ? It concerns Chief Brody suspecting another great white shark is terrorizing the fictional sea side resort of Amity Island, following a series of incidents and disappearances, and his suspicions are eventually proven true. whoa are the actors in the movie ? Roy Scheider, Lorraine Gary, Murray Hamilton etc where was it shot ? Martha's Vineyard, Emerald Coast and Navarre Beach in Florida. how was its critical response ? It received mixed reviews. the first actor mentioned above was he enlisted in the military ? Yes, he served three years in the United States Air Force as a first lieutenant in Air Operations.
wiki:5290271
Roy Scheider [SEP] Amateur boxing
Between 1946 and 1949, Scheider boxed as an amateur in New Jersey. Scheider said in a television interview in the 1980s that he took up boxing to lose weight. He said he had no desire to fight, but that his trainer, Georgie Ward, encouraged him to compete. In his second bout, at the 1946 Diamond Gloves Tournament (Golden Gloves), Scheider suffered a broken nose and lost by technical knockout in two rounds to Myron Greenberg. He went on, however, to post an 8–1 (six knockouts) record, reversing the defeat to Greenberg in the process.