"In almost every measurable physical activity, athletes show improvement over time." Barring chemical or surgical enhancement, we'll see athletes hit the pract

"In almost every measurable physical activity, athletes show improvement over time." Barring chemical or surgical enhancement, we'll see athletes hit the practical maximum human performance for various activities sooner or later. Considering that world records are broken by mere tenths of a second now, athletes may be closer to those walls than some people would think.