I used to do 2 day back when I only worked part time and could afford that life

I have also read alot of BBers that work AM and PM.
When I did it I made sure I worked 2 different body parts between AM and PM.
Keep in mind, I was like 19 then so my body recovered alot faster back then. I think 2x a day now would kill me faster then Poobs could wolf down a 1/4 lb'er from McD's....lol ( I love cheapshots).
In the end, I would not suggest, as Poobs said. Work hard and you will not need to go 2x a day; or even want to.