This little guy has always been energetic, to say the least. Being at home for school, we can accommodate his need for extra wiggle time throughout the day, while still working to increase the amount of time he can manage to sit upright in a chair being relatively still. He can usually do 20-25 minutes of seatwork before needing a break, longer if the seat is comfy, and he can behave well through a church service. For his age, I think that is perfectly fine. I can actually see evidence that his mind is free to work better when it isn't putting so much energy into trying to stop movement. The wiggles don't usually interfere with his learning anything. The challenge has been for me to remain unaffected by them!
Some examples of wiggles while learning: The entire first semester of his first grade year, phonics was done always and only under the table. He often fiddles with small things in his hand when he listens to a read-aloud and will sometimes wallow around on an exercise ball for thinking-intensive work (never handwriting practice though!) We move from table to floor to couch to table during the course of the day. The latest craze has been lying on his back on the floor, balancing his chair on his feet as I quiz him on math facts. He claims it helps him think better.
I'm wondering if things like this can count toward P.E.