Choose Between Two Options
- $49 for three personal-training sessions, plus a customized nutrition plan (a $117 value)
- $125 for eight personal-training sessions, plus a customized nutrition plan (a $312 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.
Anytime Fitness, which boasts more than 1,800 clubs in North America, makes it easier for average folks to etch out time for exercise by doing one simple thing: staying open 24 hours a day for 365 days a year. As fitness seekers challenge themselves on cardio and Hammer Strength machines and hoist Iron Grip free weights in clean, well-stocked facilities, security monitoring ensures they’re safe and producing enough sweat to meet official government standards. Members can also ramp up their exercise regimens with the help of Anytime Fitness’s staff of personal trainers, who demonstrate moves and sling motivating tips. After workouts, guests can shower in the private restrooms or hop into one of the tanning booths available 24 hours a day.