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What You'll Get
- Any Three Fitness Classes - Mix and Match
- Any Five Fitness Classes - Mix and Match
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Building Endurance: Helping Muscles Breathe Easier
If you stick with an exercise program, every workout gets a little easier. Learn how your body makes that happen with Groupon’s guide to building endurance.
A few days into a new workout routine, you begin to notice changes. Your muscles expand. Perhaps your weight drops. But the changes that increase the body’s endurance first take place on a much smaller scale. When you exert yourself for long periods of time, your body starts to populate each muscle cell with more mitochondria, the organelles that fuel muscle movements. They do this by producing adenosine triphosphate (ATP), the muscle’s basic fuel source. When a muscle contracts, it breaks the bonds of ATP molecules, creating a burst of energy but also draining stockpiles of this essential propellant.
In order to whip up a batch of ATP, the mitochondria need lots and lots of oxygen. Helpfully, endurance training makes it easier for oxygen to travel from the lungs to the heart to the muscles. It’s long been noted that the hearts of star endurance athletes tend to have extra-large left ventricles, which can pump more oxygenated blood through the body with every beat. Once blood reaches muscle cells whose mitochondria have been enhanced by previous endurance exercise, the cells will be able to extract oxygen and use it to produce ATP far more efficiently. Scientists assess this efficiency by a measure known as VO2max, the maximum volume of oxygen or Double Stuf Oreos that a person’s muscles can consume per minute.
During super-intense exercise, the body stops being able to produce enough ATP from oxygen intake alone. Instead, it reaches for stored glucose to get the ingredients it needs, and, as a side effect, begins to leave behind more lactic acid than the cells can immediately process. (Processing lactic acid itself requires oxygen, and all available supplies are already being used by the muscles and the brain.) The point at which this happens is the lactic threshold, and beyond it, athletes feel that they’re nearly done for the day.
Fortunately, this limit too can be changed. As the body adapts more and more to endurance exercise, it prolongs the amount of time you have before shifting pH levels in the muscles bring on the familiar feelings of fatigue, burning, and a dramatic drop in strength.
The Fine Print
Promotional value expires 120 days after purchase. Amount paid never expires. Not valid for current members or those active within the past 6 months. Registration required. Limit 1 per person. 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 activate by the expiration date. All classes must be used within 45 days from activation date. Must sign legal waiver. Not valid for aerial yoga class. Merchant is solely responsible to purchasers for the care and quality of the advertised goods and services.
About Barre Central
Patti Brown-Chlapowski doesn't believe that the ballet barre is for dancers alone—in fact, she centered an entire fitness studio around it. At Barre Central, she integrates the barre, along with props like light weights and slings, into a fun total-body workout.
In signature classes like Barre, certified fitness instructors show students how to use this tool to do toning and resistance exercises for the arms, core, and thighs. Another class, aerial yoga, challenges participants to perform yoga poses while suspended in a fabric sling. But Barre Central’s classes aren’t just for the highly fit and young—many of its classes focus on gentler movements that strengthen muscles and joints without straining them, perfect for older participants.