Yes. No brain, bones, blood, lungs, or heart required. Just calves and 10% balls.
Works for Nikki on certain days.
The Brain sends electrical signals to the muscles for them to fire. The Heart is the fuel pump. The blood contains the fuel. The lungs are the carburetor.
That said, these four do nothing to directly move the body down the road. The engine block is the muscle fibers and bones. The contractions of the former move the latter.
While he pulled the 90% out of his ass, he’s not wrong. Calves are the primary movers until you get to the faster race paces.
Yes true! The muscles of the calves and quads are the main shock absorbers with added help moving forwards, but I'd say most the the force generated in going forwards comes from the glutes.