$61.50 for 1 Month of Unlimited Fitness Classes at Challenge Fitness ($139 Value)

Unable to add now. Please try again later
Unable to remove now. Please try again later
Limited time remaining!
Up to 56% Off

Customer Reviews

134 Ratings


Scharon I. · 1 reviews
· Redeemed February 27, 2018
Challenging exercise. Class moves along. Quickly and I was never bored. Fun environment and friendly people. Exactly the workout I was looking for!


Servet Y. · 1 reviews
· Redeemed January 9, 2018
From the first minute of the warm up, I knew this was THE place. I was so tired of going to a gym and thinking of what to do next and feeling not motivated. Amy pushed me to my limits whilst making sure I was comfortable with my joints. I love this place already. Definitely recommended.


Deborah O. · 3 reviews TOP REVIEWER
· Redeemed December 7, 2017
Great work out location, Amy and Jorge pay attention to your form so you don't hurt yourself and they'll even recommend another activity if you are struggling with an activity.

What You'll Get

The Deal

  • $61.50 for one month of unlimited classes ($139 value)

Muscular System: The Meat of the Matter

The joys of a massage or the relief of a chiropractic adjustment—and the stresses of physical work—play out partly in the muscles. Learn just what pumps the body up with Groupon’s guide to the muscular system.

The human body has more than 630 muscles keeping it upright and mobile. They make up almost half its weight and power the movements of the bones, the blood, and even the food in the stomach. Perhaps the most familiar muscles are those seen in bodybuilding contests and facial-expression contests: the skeletal, or voluntary, muscles. They’re attached to our bones and controlled by our brains, which zap them with electrical signals to cause their fibers to contract. During a muscle contraction, filaments inside the muscle fibers slide together, stacking up on one another so that the larger fiber shortens. In shortening, the fibers gain thickness—a phenomenon we notice as flexing. Whatever muscles do, they accomplish by this single pulling action. If a bicep (part of a category of muscles known as flexors) flexes to lift a barbell, it needs a tricep (an extensor), pulling in the opposite direction, to bring the arm back down.

The other two types of muscles are smooth muscles and cardiac muscles, and both are beyond our conscious control. Cardiac muscles control the beating of the heart, contracting the chambers to push blood throughout the body. But the blood doesn’t ride to the toes on that momentum alone. Lining the blood vessels are smooth muscles that help push it along. These also line the esophagus, stomach, and intestine to move food through the digestive tract, and can even help regulate the body’s temperature by opening and closing capillaries near the skin surface, all without conscious effort. The subconscious brain is also happy to turn muscles to ends beyond their apparent purpose: for instance, what we experience as shivering from cold is simply the brain causing the muscles to spasm so they will generate heat and keep your blood and any baby chicks in your coat pockets warm.

The Fine Print

Promotional value expires 120 days after purchase. Amount paid never expires. Limit 1 per person, may buy 1 additional as gift. Limit 1 per visit. Valid only for option purchased. All goods or services must be used by the same person. Must sign waiver. Must be 16 or older Merchant is solely responsible to purchasers for the care and quality of the advertised goods and services.

About Challenge Fitness

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.