Want a real kicker? This is something my massage therapist taught me:
1 cup epson
1 cup baking soda
1 cup Seasalt (the greyer the better)
I buy the 1st two in bulk at costco, and the last bulk at my health food store.
Here's the secret!
Put the salts in a large bowl, and while running your bath boil a teakettle of water. I carry all to the bathroom. Pour the boiling water over the salts, stir till dissolved, THEN add to your bath. The boiling water is supposed to cause a chemical reaction that releases the maximum healing qualities of the salts. This is a health spa "secret".