What You'll Get
Choose from Three Options
- $28 for 10 1-hour fitness sessions for one ($250 value)
- $67.50 for a 1-month unlimited membership ($200 value)
- $125 for a 2-month unlimited membership ($400 value)
Building Muscle: Cells on the Move
Read on to learn exactly how fitness classes leave you with more muscle or better tone.
Bulky upper-body muscles might have hindered early humans who had to chase their prey across the plains, but it could help those who often had to climb trees to adjust their satellite dishes. That’s why the body builds muscle according mostly to use: do enough curls, and the biceps expand. As anyone who has experienced post-workout soreness could intuit, those curls are actually a form of controlled damage, making thousands of miniscule tears to the muscle tissue that beckon autoimmune cells to show up alongside testosterone and other hormones. The white blood cells help switch on satellite cells, which are similar to stem cells. Before they’re activated, satellite cells aren’t doing much—instead, they lie dormant around muscle fibers until they’re called into action to repair torn tissue.
This isn’t the only kind of cellular transformation at work in growing muscles. Long muscle cells, which contain several nuclei, can also begin to change type after a workout. Certain kinds of muscle fibers are equipped to handle brief bursts of effort but will quickly become tired if asked to do more intense work. These are the first to disappear as someone starts an exercise routine, as they’re converted into fibers with more endurance. This principle is so dramatic that a sports scientist can generally tell whether someone is a professional athlete or a professional mattress model by examining a minute sample of muscle tissue.
The Fine Print
Promotional value expires 120 days after purchase. Amount paid never expires. May be repurchased every 90 days. Registration required. Limit 1 per person, may buy 1 additional as gift. Limit 1 per visit. May redeem across visits. Valid only for option purchased. All goods or services must be used by the same person. Must sign waiver. Must be 18 years or older. Younger than 18 must be accompanied by guardian. Younger than 18 must have guardian-signed waiver. Upon activation, must use 10-class pass within 30 days. Merchant is solely responsible to purchasers for the care and quality of the advertised goods and services.