Knitting has long been a highly political activity. Knitting in public by women during the French Revolution was an audacious act of gender equality.
And tennis? Goodness surely you’re aware of the modern political ramifications of tennis that happen almost constantly. There are so many modern examples but let’s pick Wimbledon’s recent banning of Russia. Or Serena Williams; who for her part would rather prefer that there isn’t a political earthquake every time she steps on the court.
Perhaps a better, more honest, and certainly more realistic course of action is to acknowledge that anything involving human beings is intrinsically political, including and maybe even especially tennis and knitting, and secondly to admit that you personally would prefer not to think about the intrinsic politics of knitting or tennis when you exercise those hobbies.
That is people who play tennis being political. I play tennis a couple times a week and I have no idea the political views of those I play with
"Can be" =/= "is" =/= must be
Is sex political?
Is hugging a child political?
Yes, When politics is defined so widely as to describe interactions of humans and Society, anything can be construed as political. That doesn't mean it it is a useful or productive lens too obsess over.