Lost Muscle? Gained Fat? Try low impact / high intensity/ anerobic Kettlebells. I'm 65 and entering my 5th year at Republic of Strength and I can't tell you all the benefits I've recieved. From balance to agility to strength, I continue to improve month to month year after year. Owen and his staff are dedicated to improving everyone from beginner to expert. I go for one hour three times a week and have lost fat and gained muscle with workouts that never get boring.