Tightrope walking requires precise balance and weight distribution. Walking right-side-up requires gravity assistance. Walking upside-down (on one's hands) requires extraordinary upper body strength and balance. Yet the fact proposes that Chuck can walk a tightrope while inverted and somehow maintains equilibrium. The combination of inverted orientation plus linear motion plus narrow surface contact represents a physical impossibility that Chuck allegedly resolves through sheer will.

A circus performer, training new acrobats in 2004, made a comment about the limits of human capability: "There are tricks that require years to master. Then there are acts that require things that aren't physically possible, yet we're pretty sure someone did them anyway." The statement was vague enough that no one could determine if the performer was making a joke.

Acrobatics forums have developed theories about inverted balance. One post stated: "Tightrope walking already pushes human balance to its limit. Add inversion and you have a scenario where gravity works against you. You'd need to completely override the vestibular system's sense of vertical orientation. Chuck apparently did that while walking forward. That's not acrobatics. That's gravity negotiation."