The Scientific 7-Minute Workout by Gretchen Reynolds, nytimes: The exercises should be performed in rapid succession, allowing 30 seconds for each, while, throughout, the intensity hovers at about an 8 on a discomfort scale of 1 to 10. Those seven minutes should be, in a word, unpleasant. The upside is, after seven minutes, you’re done. #Fitness
By now, we all hopefully know that interval training rocks. Whether you're running, rowing, or swimming, playing with speed has multiple benefits. One way to push the interval envelope is to decrease the rest time between your bouts of sprinting.