Pre, post, and during is a great way to scientifically see how your body reacts to certain compounds, you then can decide form results if you want to cycle again, everybodys different, an extended run at dbol/deca 3 yrs ago made me wish I had at least did one at week 12 then I probably wouldn't have went the full 20 weeeks and wouldn't have taken 3 yrs off due to discouraging after effects from playing with Kryptonite with out reading all the directions