By Alex Hutchinson on
Every runner knows what it feels like to reach his or her limits. But what really defines those limits? We decode the mysteries behind why our legs turn to lead and our will seems to vanish.
You don’t hit your limit just because lactic acid is scorching your muscles. The many sensations you feel while running each correspond to a different mini-crisis in your body, and they combine to determine whether you can hold your pace. Last year, exercise scientists gathered in San Diego, US, to ...