If you've been following this blog from the beginning, you'll remember Anne, the physiotherapist extraordinaire I would occasionally see.
This tip came from her.
When doing work at the kitchen counter, sit down on a high chair or stool. Save your joints. Save your energy.
I have this lightweight foldable stool tucked into a corner, ready to be pulled into service. Although, like those long-ago art classes in elementary school, it just seems easier to cook while standing. So, I do, whenever possible.