My kids have been filling the sandpails with leaves and then dumping in my big bucket which I then put in the composter. So if nothing else they are walking. Some days I keep the sandbox closed which makes them more likely to use the slide, balls, etc. But if it is open then some go there and stay the whole hour till they are picked up moving to another side of the box if they move at all. Lots of bending over and reaching but not the same as running for sure.

I also find if I make myself "busy" doing something such as pulling weeds. I used one of those dandelion pullers you step on and pull them out. Works really well and we are seeing progress in that there are less in the play area now. I will also take my little snips and trim plants - anything to not be available as the entertainment since if I just stand there they expect me to lead the play.