Grounding can be defined as basic training or instruction in a subject.  As I watched this lady walk her dog while on a rink and on skates, I figured she must have a good grounding in skating.  I was amazed that they both were able to stay upright.

What do you have a good grounding in?  If grounding seems a little difficult to capture, how about going a little broader and show us what it is that grounds you.  Or just show us the ground.