returns. It’s far better and definitely more productive to try a variety of fast-paced sessions. I learned this the hard way, many years ago, when I failed to inject enough variety into my training. The result was that I lost the big, season-ending race

So you want to start running? You've heard it's inexpensive, great for your health, the best way to lose weight (and keep it off). You've got friends who run, and they're trim, happy, centred and productive.Running also looks like a straightforward

medicine groups, which have generally advised endurance athletes to drink 600ml to 1,200ml per hour. This is more or less where things stood before the NEJM publication last spring. A trio of triggersAfter the NEJM article appeared on 14 April, I waited a