Ms. Reynolds has distilled the knowledge gained from years of fitness reporting into a new book, “The First 20 Minutes: Surprising Science Reveals How We Can Exercise Better, Train Smarter, Live Longer,’’ published last month.
Ms. Reynolds makes a clear distinction between the amount of exercise we do to improve sports performance and the amount of exercise that leads to better health. To achieve the latter, she explains, we don’t need to run marathons, sweat it out on exercise bikes or measure our peak oxygen uptake. We just need to do something.
Two-thirds of Americans get no exercise at all. If one of those people gets up and moves around for 20 minutes, they are going to get a huge number of health benefits, and everything beyond that 20 minutes is, to some degree, gravy. If people want to be healthier and prolong their life span, all they really need to do is go for a walk. It’s the single easiest thing anyone can do. There are some people who honestly can’t walk, so I would say to those people to try to go to the local Y.M.C.A. and swim.