Many of us who join the military were once considered "couch potatoes" when compared to the amount of daily activity we do while in the service. We may be a little out of shape in the beginning, but once we start a new physical regimen, something incredible happens to our bodies biologically.

When we put our bodies through physical exertion, we start to feel pretty awesome due to an increased heart rate, which pushes extra blood and fresh oxygen into our brains. This floods our brains with those amazing endorphins — which everybody loves.


However, the next day, your body typically enters into a phase called "delayed-onset muscle soreness," during which you're probably not so happy anymore.

It must have been leg day... yesterday.

This soreness typical lasts for around 72 hours as your body rebuilds itself. The good news is that, as you continue to regularly work out, you're less likely to experience a severe rebuilding process. So, start getting your bodies used to the process sooner rather than later.

Over the course of a few weeks, your body will produce mitochondria that convert carbs, fats, and proteins into fuel. Once you start getting into a regular workout routine, you can increase mitochondria production by nearly 50 percent.

That's a sh*t ton!

With the increase in mitochondria production, your endurance increases and the exercises that you thought were tough three weeks ago may not feel so difficult anymore.

Exercising will also enhance your bone density, which directly lowers your risk of osteoporosis.

The disorder can be painful. (ePainAssist.com)

Other physical health benefits include lowering your chances of developing arthritis, type 2 diabetes, dementia, and various types of cancer. Many exercise fans have also noticed a decrease in mental depression as workouts tend to reduce the levels of stress hormones, like cortisol.

A perfect way to boost morale.

On the flip side, starting a workout routine is just one piece of a larger battle. Service members and veterans need to focus on maintaining a healthy diet to supply proper nutrition to the body. Eating a whole chocolate cake after a workout might feel awesome as you take the first bite, but chow down for too long and you'll start to feel sick.

Plus, you just wasted a solid workout.

Talk about a hardcore meal-prep session.(Photo by Airman 1st Class Nathan Byrnes)

However, we understand the occasional cheat meal — we all do it.

Check out Tech Insider's video below to get the complete, animated breakdown of how awesome your body is at adapting once you start working out.