Running is a great form of exercise. It gets your heart rate up, burns calories, and improves your stamina. Running long distances can get you into fantastic shape, and it has many neurological benefits as well. Per a semi-reliable source, after you run about two miles, your body thinks that you're dying and pumps endorphins into you, which is colloquially known as a "runner's high."

There are also many kinds of races you can run. You can participate in 5Ks, half-marathons, marathons, and triathlons, to name a few. I've recently decided to train for a half-marathon. I have gotten to experience the benefits of running, but even with all that good stuff, running a half-marathon sucks. Here are 8 reasons why.

1. You may pee your pants.

When you run for 60+ Minutes, you will most likely need a restroom at some point. Things happen out there, especially if you choose to run on nature trails, which generally have no restrooms. We don't talk about it.

2. Your calves will feel like they're going to fall off.

You may fall down a few flights of stairs when you figure out just a little too late that your legs can no longer support you.

3. You will develop both runner's face and some painful sunburns.

What is runner's face you may ask? Well, it's when your face starts to get saggy because of the wind and sun beating down on you. Also, those sweet tan-lines are going to haunt your ankles for years.

4. Your toes may turn black.

Yeah. Runner's toe. You can pretty much get runner's anything.

5. You will have no energy after.

Don't make plans to do anything the rest of the day. All you will want to do is eat and take a nap.

6. You will want to brag about your running skills (all the time).

If you just ran 10 miles, then you probably want to tell your mom about it, and your dad, and your boyfriend, and your best friend, and that kid from biology.

7. You start to miss running (what!?).

Somehow, on the days that you don't run. you'll find yourself thinking about running.

8. You will enter a new realm of fitness.

You are gonna be fit. So fit, that you will probably never be able to get back to this level of fitness again. Unrealistic expectations ensue. Enjoy it while it lasts!