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Sarah Kolvas

Sarah Kolvas is the associate editor for Fitness Journal.

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Article Archive

Teeth anatomy

Toothsome Facts

January 11, 2021

Whether you’re eating, speaking or smiling, your teeth play a big role in daily life. These small structures in the mouth are complex and powerful.

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Spleen Anatomy

Screening the Spleen

November 9, 2020

Though known for being a nonessential organ, the spleen plays a significant role in immunity and blood health as the blood’s filtration mechanism.

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IDEA World Virtual 2020

Inspiring Greatness at IDEA® World Virtual 2020

September 30, 2020

For the first time in 38 years, the global fitness community that is the IDEA® World Convention was not able to meet in person. Despite that, the crackling energy and essential rite of gathering to share ideas and buoy each other breathed fresh air into the 8,000 attendees, sponsors and presenters who attended via the ether on August 21–22.

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Natiya Guin and Desi Bartlett

A Pregnant Pause

September 8, 2020

Desi Bartlett, MS, CPT, E-RYT, met Natiya Guin at her yoga class and later guided her training through her second pregnancy.

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Thyroid anatomy

Thanking the Thyroid

September 8, 2020

Part of the endocrine system, this butterfly-shaped gland secretes hormones into the bloodstream as directed by the pituitary gland.

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Calming the nervous system

On Your Nerves

July 13, 2020

Talking about the nervous system may bring to mind rapid bodily responses to stress, but there’s more to this intricate bundle of fibers.

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Nicole Simonin and Colleen Donofrio

Losses and Gains

May 13, 2020

Starting a fitness program can be daunting, especially when your only exercise is the occasional walk or yoga class. But when Colleen Donofrio, then 57, heard about personal trainer Nicole Simonin’s successful program, Shape It Up, her motivation to improve her health—and her yoga poses—outweighed her fears.

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sartorius muscle

Sizing Up the Sartorius Muscle

May 13, 2020

You may not be familiar with the sartorius muscle, but you’ve no doubt flexed it during countless lower-body exercises, stretches and yoga poses.

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Ear facts

All Ears

March 11, 2020

From infections to hearing disabilities, you may think you’ve heard it all when it comes to the ear. This complex system of tiny parts not only helps us to process sound but also keeps us balanced and performing well during physical exercise.

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Diagram of the mitochondria

The Mighty Mitochondria

December 19, 2019

It’s time to revisit one of the basics of biology: mitochondria. These organelles, which occur in almost all types of human cells, generate adenosine triphosphate (ATP), the energy that cells use (New­man 2017; Newman 2018). They are critical for powering metabolic processes, making them a building block of physical health and fitness.

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Aaron Seaton and Andrew Sung

Slow and Steady Wins the Gains

December 18, 2019

Andrew Sung had tried multiple training programs, but nothing seemed to help him reach his fitness goals. When he found personal trainer and competitive bodybuilder Aaron Seaton, that all changed.

“Andrew came to me with a defeated outlook,” says Seaton, a multicertified NASM trainer. Still, “he was highly motivated; just unsure how to put the pieces together.”

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Picking the Brain

October 21, 2019

As the control center for the body’s nervous system, the brain participates in every human function. From sensing to controlling motor skills, its vital role in movement means this cognitive powerhouse is—literally—the brains behind your work as a fitness professional.

There are three main components that make up your mind:

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Flexing the Muscular System

September 24, 2019

As a fit pro, you are all too familiar with training muscles to build strength, mass and better movement in your clients—by now, you might consider it muscle memory!

Yet, as a major system present throughout the body, the muscular system is vast and intricate with plenty to explore. After all, muscles produce every movement, from the basic, like digestion and respiration, to the complex, like running, dancing and weightlifting.

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