We need something to train our monsters, like let's say that you got the terrisor (sorry about spelling) and you want to test him out, but your out of stamina, but if the training thing is there, you could pick a campaign level you completed, and train on it

@D-Orion-Pehrson Something similar has been suggested by others. I imagine this is low on the priority of things for SP to add. To get around the lack of stamina, I suggest adding friends and then asking them for stamina on a regular basis. Have a bunch of extra stamina handy at all times.