Getting really itchy while running?

Question

Whenever I go running or exercising, my legs and sometimes entire body suddenly gets really itchy. Why does this happen and how can I stop it?

Answer 1

it's sweat. I use an eliptical and keep a backscratcher near by. you could also carry a hand towel with you and wipe down quickly or during your cool downs to help.  

Answer 2

Most probably sweat, dripping through your clothes, making you itch

either wear differeny clothes, or put a little bit of talc on