Guys, imagine if you could work out for 20 minutes just three times a week, lose weight and vent your frustrations at the same time. Then envision doing that at a gym without mirrors, free weights or treadmills. One more thing: you can sweat and burp without insulting women because it's a men-only club. Boys, welcome to Blitz.
In the 14 years since the first Curves fitness club for women opened, the single-sex, express-gym business has exploded, accounting for close to 25% of the entire U.S. health-club market. Figuring what works for women should do just as well for men, a...
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