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Here's a fun idea for a shot like this when doing manipulation in post.
Shoot this one just like it is with stool. Then when the boys are gone. Same angle, tripod, etc. Shoots various sweeps of the tripod to get a motion blur from the background. Then put the boys back in so they are captured frozen as the background, grass etc, is blurred from the speed. Oh. And don't forget to have that shoestring angle backward.