Your pet has been put in for a lesson of Strength Back Or Add an Alert

Could somebody explain to me, what this means? Have been offline for a while and well I would like to start training my pet again. But Im not sure what this is =)

It just alerts you when your pet is done training. It's really helpful, I use it all the time. :) You'll get a little pop up on the right of your screen, like any other event.

It just means that you'll receive a notice when your pet is done training.

Awww, thats pretty cool. Thank you both for answering =)