When is the best time to take soy protein in conjunction with a tae-bo workout?

Answer 1

Males shouldn't take soy because it raises estrogen in your system (most men don't need female hormones.)

In addition to that problem, no one else should take soy because of the various health problems outlined here:
http://www.mercola.com/article/soy/index.htm

Read the articles found there on Dr Mercola's site and you will probably change your mind about taking soy in the first place. The only studies that have found soy to have to side effects are those which were funded by the soy industry.