OK, I"m lame, can't run one step, play tennis once in the last two weeks.
I can easily play 2 singles matches (2 out of 3 sets), and 3 doubles matches in one day. E A S Y.
I'll suck at them all, I'll need food and drink, but I can PLAY all those matches. And I might need hospitalization afterwards, but I can PLAY those matches, as can anyone.