Experts say a lack of time is no excuse for being sedentary, because high-intensity interval training (HIT) can deliver the same benefits as long-term endurance training in far less time. That means that doing 10, one-minute sprints on a bike with a rest period in between can increase endurance as hours of moderately-strenuous biking. It's not even necessary to do "all out" sprints with HIT, the researchers found, because benefits can be seen with HIT done at approximately 95 percent of maximal...