There was a short discussion about this over in the Rerun/replay animations thread.
There’s now a ReRun button on the page. When you click it, a marker is animated along your activity path.
I’ve had to make this a Subscriber-only feature, because it’s tied to map views & those cost 
.
It’s quite a simple thing, as it stands now, but it can be improved from here…
One suggestion was to clear the map of the activity line, to add a layer of ‘discovery’ to the animation.
Another suggestion was to have visual call-outs at each moment the activity completed a street.
Let me know here (or in that other thread, if you’d prefer) if there’s anything else you’d like to see with this ReRun feature.