You know a sweat session has major health and stress-relief benefits.
But what is happening head to toe? Here’s exactly what a workout does
for you.
1. You burn calories.
When your body breaks down energy-dense foods, like carbs and fats, it
turns them into the molecule ATP (adenosine triphosphate). Then, when
the body converts ATP into ADP (adenosine diphosphate), it gives off
energy and allows muscles to contract and move. It’s what we mean when
we say we’re “burning calories,” says Joseph E. Herrera, DO, chair of
the Department of Rehabilitation Medicine for the Mount Sinai Health
System.
2. You heat up.
As your body burns calories, its temperature rises, and you sweat. “Sweat wicks away heat, which allows your body to keep
working out without overheating,” says Herrera.
3. Your heart beats faster.
Exercising raises your heart rate in order to quickly push blood and
oxygen to the muscles. If you train for endurance events often, your
resting heart rate may get lower, says Herrera, as your heart becomes
more efficient at supplying blood to your organs and muscles.
4. Digestion can turn wonky.
Ever felt like you suddenly had to go to the bathroom after starting a
run? Blood flow is directed away from your core and intestines to your
large working muscles, which can lead to diarrhea. Tip: Avoid food an
hour before exercise.
5. Happy hormones flow.
At the start of a tough workout, you get a spike in adrenaline and the
stress hormone cortisol. Your body senses you’re in “flight” mode
(i.e., trying to escape a threat). Next, endorphins help cut muscle pain
and improve mood. Other compounds, called endocannabinoids, may also be
partly responsible for that “runner’s high,” according to animal
research.
6. Your brain gets a boost.
Aerobic activity improves our thinking skills and memory, possibly
because there’s increased blood flow to the brain during exercise.
Getting active may also promote brain growth.
7. Muscles get stressed (in a good way).
Each time a muscle is challenged, micro tears occur, says Herrera, but they aren’t harmful; they contribute to muscle growth over time.