Some of the Kroells Karate Clubs daycamp shirt ideas;

I am indestructible.
You can win if you dare.
Do you have what it takes?
We are the champions.
Are you in or out?
Train hard or step aside.
Make your best better.
Grasshopper see, Grasshopper do.
Got Kicks?

Winning Idea "Evolutionary Skills" thanks Mr Pieper