Threshold

It's the point at which change can occur with momentum.

On a bike, it's that point where you might "blow up” but probably won't. It's the last stop… The razor's edge. The crossroads where if you pedal any harder you will not be able to continue and if you stop it will be hard to get momentum again.

Threshold is the moment where psychological change can occur. The pain of staying the same is equal to the pain of change. It's the point of inflection. Notice when you were at threshold… It's where personal growth lives...