Fitness is no longer a hobby: these days, keeping in shape is a lifestyle. Turn to social media, and you’ll find reams of images of toned, young things perfecting their squats in the gym.
The number of Americans with gym memberships has risen three-fold, to 62.5million, according to Bloomberg, and roughly a fifth of adults workout every day.
Although health officials say the average American should be doing more exercise, some experts have warned that some are in fact doing too much.
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