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Here are the cities where fitness buffs can find the highest concentration of gyms.

Widespread interest in exercise and gym culture is a relatively recent phenomenon in the United States. While physical activity has always been part of daily life in some form, it wasn’t until the 1970s that going to the gym became a mainstream pursuit. Influenced by cultural icons like Jane Fonda and Arnold Schwarzenegger, and fueled by the rise of aerobics and strength training…