How to prevent cramps while running (my side and calf)

Bananas! They have a lot of potassium, which prevents cramps. Also, pace yourself. Don't start off at a fast pace, just ease yourself into it. As for your calves, run with your whole foot, from heel to toe, especially if you tend to run on the balls of your foot or your toes like I do. And DRINK!

Side stitches are due to oxygen deprivation. This can happen because you're running too fast for too long and it's made worse by running too soon after eating, especially a large meal your body needs to work hard to digest. Calf cramps are generally due to an electrolyte deficiency. You need more sodium and potassium. You can get sports drinks (I avoid sugary ones because if you're eating enough good foods you have enough carbs for energy.) or you can do what I do, which is add lemon juice and a pinch of salt to my water when I'm working out long. You really, really don't need to worry about salt the way people think. Eat more salty foods and that will help too.

i get a cramp in my side too, whenever that happens i basically just grab the area and squeeze hard. i keep running as i'm doing this, and it works every time. the cramp goes away in about 15-20 seconds. i was talking to a personal trainer once about this and he said that's actually the right thing to do, he rattled off some biological reason why this is an effective way to reduce cramping.

sorry for all the bro science here, but this method works really well for me!