If you have Asthma then itll obviously happen. But if you dont then its caused from breathing in through your mouth. When you breathe in through your mouth the air goes unevenly into your lungs. One of your lungs is gonna have more air and that causes your sides to hurt. Heres some advise, if u cant breathe then stop running. :)
if you can run, run! If you cant watch from the side
it floods your airbox with water. no air it cant breathe. same if the water gets in the exhaust pipe. run snorkels on it to avoid this problem :)
You run out of breathe easily because the air is more thin
Do you mean a cramp?
its a game u play outside and in side u cant run with the ball u have to trow it to someone in your team
YOU RUN OUT OF AIR TO Breathe and you do not have any oxygen
Of course dogs breathe when they run! they dont hold their breath!
Even If it's slightly broken, or even hurts, you won't be able to run
you need to stretch out before you run and see if that helps.
breathe better is a yes run cooler never seen that happen
when you run you breathe faster so yeah....... :D (I know that was lame)
Russian for "love hurts" is любовь ранит, pronounced liubof' ranit (the last word sounds like "run it" or more precisely "run+eat" but said as one word)