He stayed in good physical condition when he was released, so maybe he was able to get some exercise in.
Probably had a shouting match with the door about how unprepared it is for at least half of the time.
"And all those exclamation marks, you notice? Five?
A sure sign of someone who wears his underpants on his head."
I remember him commenting about how he practiced for 10k years with his glaives against Arthas.