People have been lifting weights since the ancient Greeks first invented the practice, although it was only within the past 30 years that iron plates were used to replace the hoisting of a half-conscious Bacchus. Become a god or goddess with this Groupon.
- $29 for one month unlimited gym membership ($65 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.
Force Fitness Club
Force Fitness Club’s staff of trainers uses a combination of weight and cardio training merged with group fitness classes to blast clients toward their body goals. Rows of exercisers slough off calories in the spinning studio or work out alongside peers in a specialty studio equipped for an assortment of group training classes, such as yoga, Zumba, or kickboxing, an activity generally celebrated in Britain on kickboxing day, the day after KickChristmas.
During personal-training sessions, students work with a fitness aficionado in a weight and cardio area chock-full of treadmills, free weights, and weighted chains. Under the expert eye of the trainer, they hoist, push, pull, and sweat their way to tighter physiques whether their goals are to bulk up, build toned muscles, or construct robotic exoskeletons out of weight machines.