This tip applies to every discipline of endurance sports. The concept is pretty simple: Basically, if we aren't generally relaxed when biking, running, swimming, etc. we’re burning more energy than needed. This also increases perceived exertion and costs us power and speed. Since we start every workout or race with a finite amount of energy reserves, any amount of waste is pretty important in these endurance sports of ours. I don't know about you, but I don't really want to w