We had a table in our building's basement where we stayed. It was awesome practicing, and of course I became good at it.
Sadly these days, I don't get the time to play it anymore. But I can probably beat everyone in this thread with 5 or 10 warm up matches.
Just to get the old muscle memory going again, you know? I can cover a lot of ground, and I manufacture angles to hit unplayable shots.
One thing I never acquired though was a strong back hand. I can defend fine with the back hand, but I cannot smash with the back hand.