And,says Haskell,the prospect5 of having to gasp6 and strain their way to better health at a 70-80 percent target range has kept a lot of people from trying.

• 哈斯卡尔说，“一想到要达到必须在70%25到80%25范围之内的健康指标，就必须气喘如牛，竭尽全力地锻炼身体，许多人便望而却步。”