New Delhi, June 30 -- Les Mills, the New Zealand Olympian who founded the gym chain that bore his name, died Monday at age 91, his company said.

A statement posted to the website of the company Mills founded said he died "peacefully." The statement didn't cite a specific cause.

Leslie Roy Mills represented New Zealand at four Olympics, competing in discus and shot put, and won five Commonwealth Games medals. He was the mayor of Auckland, New Zealand's largest city, from 1990 to 1998.

His name is best known in connection with the fitness brand he founded, beginning with the first Les Mills gym opened in Auckland in 1968. A chain of 12 gyms now operates throughout New Zealand.

Mills' son, Phillip Mills, later launched the Les Mills Inte...