I see like two ways about the "how to take" advices.
Some people advise to take is 4x/day 5mg, other, like you, 20mg 1-2h before exercice.. To be honest, I am a little bit lost, so, I think that I will test by myself or I will never know how to do.
8 weeks with 5mg each 5 hours (7 - 12 - 17 -...