What destressing techniques do you use?

Some weeks are worse than others. The weeks when you're given a bit more information than your head can reasonably accomodate with out popping like an over inflated balloon.. and you're taking exams daily, how do you de-stress? I suspect that hopping on a treadmill would work well with my study notes in front of me... but how to you manage your day to day stresses while retaining your sanity and the information you're studying? :dzed: