Adult club for competitive and rec swimmers With Michael Phelps leading the USA team into Olympic history, a new spark of interest in swimming as a competitive sport has come about. The Turlock Masters Swim Club is one Valley club that has seen an increase in membership over the past year, adding to the excitement of area swim events. “We have increased our membership substantially since the Summer Olympics in London,” said Lew Boyle, co-founder and board president of Turlock Masters Swim Club.