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Jon Giswold
Jon Giswold is a certified group exercise instructor and personal trainer who teaches in New York's most prominent fitness centers, including the Reebok Sports Club/NY. He has been...ver maisJon Giswold is a certified group exercise instructor and personal trainer who teaches in New York's most prominent fitness centers, including the Reebok Sports Club/NY. He has been featured in several fitness videotapes and in many national and international and magazines. He is the author of Basic Training: A Fundamental Guide to Fitness for Men.ver menos