I can think of dozens. Running, dance, knitting, painting, woodworking (you can go very far for much less than $3k), archery, chess, board games, drawing, painting, brewing, darts, cycling, etc. etc.

Obviously you can spend pretty much any amount of money on those if you want (if you are "serious" about it) but you don't have to and most people don't. Also he said this $3k expenditure wasn't for serious work.