Let’s face it, we humans are hard on our feet. Perhaps not as hard today as our pioneer ancestors, but we still put them through a lot in a typical day. That is why I think my wife has never said no to a foot rub. This can be the kind service that you do for your wife, who is likely been on her feet a lot during the day as well.
You might try a massage and a footbath. These are relatively inexpensive and can be bought at many local stores. If you offer to this without, you never know what you might return the favor.