O2 OxyFit Gym

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Up to 95% Off
10+ bought

What You'll Get


The Deal

  • $20 for 20 gym visits including classes and equipment orientation ($400 value)

Mini-Muscles: Why Don’t Women Bulk Up When They Lift Weights?

Ever wonder why workouts often do different things for women and men? Find out with Groupon’s answer.

Women’s strength-training classes often promise results such as a toned, slim, or defined body—but they almost never promise to add bulk. Yet these very same workouts do just that for men. That’s because although a rigorous strength-training routine can help a woman boost her endurance and lower her body-fat percentage, it won’t help her develop big, bulky muscles (not without anabolic steroids, anyway). Just look at the world of professional weightlifting—successful women will squat many times their own weight, but won’t achieve the same physical proportions as their male counterparts.

One key factor is estrogen. The hormone, which is present in both men and women at different levels, works hard to limit the body’s capacity to develop new muscle tissue. This has a practical explanation. Women’s bodies have evolved to retain the ample fat stores needed to ensure fertility and successful pregnancy. Men’s bodies don’t have the same obligation, and so they possess far larger quantities of testosterone—the muscle-building hormone—than women do. This is an example of sexual dimorphism, a physical difference between males and females of the same species, not unlike the male peacock’s feathers, the lion’s mane, or the gander’s jaunty hat collection.

The Fine Print


Promotional value expires Jan 18, 2015. Amount paid never expires. Not valid for clients active within the past 6 month(s). Appointment required, 24 hour advance notice required. Must activate by expiration date on voucher; membership expires 30 days from activation date. Limit 1 per person, may buy 1 additional as gift. May redeem across visits. Valid only for option purchased. All goods or services must be used by the same person. Merchant is solely responsible to purchasers for the care and quality of the advertised goods and services. Merchant is solely responsible to purchasers for the care and quality of the advertised goods and services.

About O2 OxyFit Gym


By purchasing this deal you'll unlock points which can be spent on discounts and rewards. Every 5,000 points can be redeemed for $5 Off your next purchase.