Here is a link to an excellent article that explains why I get that amazingly pleasurable and satiatied feeling after weight sets that take me to muscle failure ...

http://well.blogs.nytimes.com/2011/02/16/phys-ed-what-really-causes-runners-high/?scp=1&sq=runner's%20high&st=cse

Thanks Globe -- this was really interesting -- especially this statement:

Now the researchers saw that both activities lit up and sensitized portions of the animals’ endocannabinoid systems, intimating that the endocannabinoid connection may lend both exercise and dessert their appeal.

In other words exercise and sugar both light up the same areas of the brain, and give the same type of pleasure -- no wonder I can't wait to get outside!! It's my new sugar!

I totally believe and agree with this, I've read about becoming becoming depressed when they don't run also the lady who replied saying she feels like she is "floating" pretty amazing.