More often than not we don't spend money on a given day. Since I went back to work that has helped since if I'm at work I can't spend any money! Neither of us goes shopping as a form of entertainment and we don't go into stores without a specific purpose in mind.
My temptation is online shopping. To curtail that I'll bookmark a site or put an item in a "wish list" and then think about it for a week or three, sometimes months. Years ago I waited a year for a specific air compressor and drill press to go on sale before buying them but I had set aside the money for that purpose. Decades ago I learned that impulsive purchases rarely work out well. And we never, ever, pay credit card interest charges because we pay them off in full every month.
We keep a spreadsheet on the computer forecasting the next several months of expenses like utilities, groceries, etc. and that gives us a fixed number that is available for discretionary spending. That number is rarely exceeded and then only after much discussion.