Women are less likely than men to become active because of body image and competency fears, according to Sport England research.
Sport England has started a campaign called This Girl Can to help encourage more women to take up exercise.
It uses slogans such as "Sweating like a pig, feeling like a fox" and images of normal women enjoying sport.
"We want to tell the real story of women who exercise," said Sport England chief executive Jennie Price.
"They come in all shapes and sizes and all levels of ability."
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Sourced from BBC Sport Website