Have often wanted to try a double, but found it difficult enough to recover after a single. I perspire easily, and a lot. I hear about all the toxins that are being released in the sweat, but I lose a lot of salt and other electrolytes too. I find that the coconut milk is not enough. I have switched to using a 32 oz bottle of Gatorade (G2) in class instead of water. I also drink an 8 oz glass of V8-low-sodium before class, and at least one 8 oz glass after class. I know the “low-sodium” sounds strange, but they get rid of some of the sodium and load up with 820 mg of potassium in 8 oz of juice. Combined with the G2, it seems to do the trick. I recover much quicker after class and feel I might be ready to do a double.