3, 5 or 10 One-Hour Personal-Training Sessions at DFL Fitness (Up to 70% Off)

Grogan's Mill

from $69 Buy!
Value Discount You Save
$210 67% $141
Limited time remaining!
Over 10 bought
Limited quantity available

Choose from Three Options

  • $69 for 3 one-hour personal-training sessions ($210 value)
  • $109 for 5 one-hour personal-training sessions ($350 value)
  • $209 for 10 one-hour personal-training sessions ($700 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.

In a Nutshell

Personal trainer works one-on-one with clients, motivating them through workouts tailored to them

The Fine Print

Expires 90 days after purchase. Limit 1 per person, may buy 1 additional as gift. 3 sessions must be used within 2 weeks once activated. 5 sessions must be used within 4 weeks once activated. 10 sessions must be used within 8 weeks once activated. Valid only for option purchased. Limit 1 per visit. Merchant's standard cancellation policy applies (any fees not to exceed Groupon price). Reservation required. Must be 18 or older. Must sign waiver. Merchant is solely responsible to purchasers for the care and quality of the advertised goods and services.

For those who take care of their overall well-being with exercise, yoga, and balanced nutrition
Warm weather essentials that prep bods for the sun with tanning, toning, and beach-ready apparel