I purchased for the sole reason of using them while doing Beachbody's Insanity.  They are great!  They keep my dry, they keep me supported, and they stay in place and don't ride up.

They are very comfortable, in fact I have begun wearing them to work more and more.  It truly feels like you are wearing nothing.

Some people complain about not having a fly, but I like this fact.  When you are working out you don't need a hole for things to fall out!

They feel great, and my girlfriend says they make me look super sexy, so she ask that I wear them around the house!