Activating this trainer:
Press F1 at main menu.
Listen for 'Trainer Activated'.
Press desired hotkey. All hotkeys can be changed on the trainer.

Trainer Options:
NumPad1: Infinite Health
NumPad2: Infinite Stamina
NumPad3: One Hit Kills
NumPad4: Change Money By 500
NumPad5: Super Speed
NumPad6: Slow Motion

Editor Options:
Misc: Money

Notes:

Change Money: In arena go to the store so your money is shown. Press hotkey, close the store and open it again to see changes.