Impatience can be a virtue. Performing lots of interval training one week each month improves your fitness more than spacing out the sessions, reports a new study in the Scandinavian Journal of Medicine & Science in Sports.
In the study, one group of male cyclists did two high-intensity interval-training sessions per week for 4 weeks. Another group knocked out five sessions in the first week, then one session per week for the rest of the month. Each group also included steady cardio sessions. The key: Everyone did the same number of workouts. “The only difference was the way of organizing the training,” says lead study author Bent Ronnestad, Ph.D.