One of the fastest-growing fitness trends is also one of the most divisive. To its fans, it promises a stronger, healthier body; to its critics, it’s another way to make women feel insecure. Time to sort fact from fiction One of the fastest-growing fitness trends is also one of the most divisive. To its fans, it promises a stronger, healthier body; to its critics, it’s another way to make women feel insecure. Time to sort fact from fiction The Guardian’s journalism is independent. We will earn