Heart rate monitors, activity trackers, smart watches -- there is a lot of technology out there at your disposal. But what can competitive athletes use to track both physiological stresses of training and activities of daily living? You've probably heard of Firstbeat; here's a comprehensive look at the system and software.
The latest research used Norwegian and French World Cup skiers to look at how VO2Max and heart rate variability fluctuate over the course of one or several seasons. Plus, a new kind of "neurodoping" is now possible, using electrical currents or magnetic fields to make your brain better at everything.
Bjoern Daehlie spills the beans about interval training in the 1990s.