Knitting and classical chess looks compatible. Just imagine Carlsen, Naka, Caruana, etc knitting while waiting for the opponents move. 😎
Apart from boxing, what else would combine well with chess?
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My vote is for a triathlon during which you play a "blindfold" game against a computer (same for all competitors) via an Internet connected headset and microphone.
Football, swimming, hiking in the mountains, floating in the sea on a rubber dinghy, tennis and whisky.
On a day like today in coastal Oregon, a growler full of beer goes well with chess. That's what I've got in the fridge.
Whittling
Make another chess set while waiting for your turn