Highly concentrated magnesium baths are even better in my experience. I read about a marathon runner who tried one, and he said his recovery time was much quicker.

When I felt so exhausted as if I'd run a marathon, I tried it, too, I was stunned by the speed and energy value!

This was 4 heaping tablespoons of Ancient Minerals, which I guess is 2-3 oz, for 30 mins. I haven't tried Epsom salts, but they may be just as good.

P.S. When the bath temperature isn't toasty, the Mg doesn't seem to absorb so well. The extra heat can really open up the pores?