Elephant in the room alert!!!
Just imagine if we could get Robyn to comment here on the matter.
Not that I have any expectation of this happening, (like I'm so sure) but like Tami she's made her living, like, doing this kind of thing; working with kids and strength training.
Rarely. As with academic giftedness, athletic giftedness is rare. And .......well.........how do you define it ? There are so many attributes to physical intelligence.
I would say there are specific markers that are sport-specific. For example, a child who would make a great acrobat has a load of fast-twitch muscle, is flexible, and has a strong core. They need to have excellent kinesthetic awareness (brain-aware on how to move) & proprioception (brain-aware on where the body parts are).