it will make a big diff. You will sweat so much more. People use this to help loose weight quicker.
Is it a good idea?
HELL NO!!!!! Your not loosing fat, just loosing water. This means you'll have less water in your system and heal slower. plus you'll also start to retain water and acctually look fatter. plus, running and making yourself dehydrated is bad for your brain and your body.
dont do it. Its for idiots only.