Contrary to what you might believe, getting faster doesn’t necessarily come from huffing and puffing through your hardest speed workout. The most effective payoff often comes from quality threshold sessions , which don’t involve an all-out effort. The key to executing threshold workouts comes down to controlling pace. Do it right and you can add more volume to your schedule, leading to faster speeds on race day. One of the best ways to increase the volume of your threshold work is via the Norwegian double threshold method, a strategy designed to maximize hard days—without overdoing it. Marius Bakken , MD, a two-time Olympic distance runner, recently released his book, The Norwegian Method Applied , which explains the principles behind double threshold workouts and how to add them to training. Bakken experimented with double thresholds throughout his career, running professionally from 1990 to 2006.…