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1.
When you bring a low leveled friend (in a video game) to a high level area to train them really fast.

or

pulling an all nighter to train your character(s) to a higher level to make a boss or level easier.
"Dude, thanks again for power training me now i can hold my own against level 54 monsters."

or

Mom- "What are you doing up? it' 4 in the morning?"
Child- "I'm power training so i can beat the demon and save the 5th demension!"
by rewand0099 June 15, 2009