It's basically the day one beginner's exercise. Hold your palms out as if holding a ball.
What is it? Properties? I don't know. I tried to read basically a history of physics in the past few weeks. The "Standard Model" says there are four forces, the weak force, the strong force, gravitational force, and electromagnetic force. There isn't a successful unified (verifiable) theory. The more they try, the more outlandish the ideas get (Like we are in a 3 or 4 (including time) dimensional "holographic universe" but reality (most of it subatomic) is in 10-11 dimensions because the math that balances the equations to try to unify things works out this way (in the math)).... Physicists don't really define "energy" so it's hard to say. It seems a little like that, except the "qi ball" and Qi likely sound like some kind of alternative medicine idea and/or a little too vague a description of too many things ( you breathed clean air/qi, you ate nutritious food, those give you energy and "qi" etc. ). Obviously that all gets a little too out there. "Qi ball" ain't so bad.