You seem to have the notion that pro athletes just tumble onto the field at game time to play a game. Or that musicians just show up at concert time and have the rest of the day to themselves.
There are thousands upon thousands of hours of numbing practice sessions to get to the pro level and also to stay there. This, I can assure you, is not fun.
Most of us would drop dead after one summertime NFL practice.
Trust me, if being a pro athlete was as easy and pleasurable as you make it out to be, a lot more of us would be doing it.
Spending hours on the court practicing tennis or hours and hours practicing drumming does not turn tennis or drumming into work.
I can assure you