"And when we go from braking to accelerating to cornering, the G-forces we pull are really demanding on our bodies. We definitely have to be in top shape"

In this quote, Michael Andretti is explaining the physical demands of driving a race car. He explains that the shift from braking to accelerating to cornering puts a lot of stress on the body due to the G-forces included. G-forces are the forces that act upon a body as an outcome of acceleration or gravity, and in the context of racing, they can be rather intense. Andretti stresses the significance of remaining in leading physical shape in order to deal with these demands. This highlights the physicality of the sport and the level of physical fitness required for chauffeurs to carry out at their finest.