Twelve to seventeen minutes is plenty on the treadmill--if it's done fast. That's all you need for cardiovascular benefit. You don't need to spend that extra time unless you are over weight and you need to burn off extra calories. Do it vigorously, like somebody is chasing you. You've got to do it hard. Otherwise, if you just take it easy and do it longer, you are spending all that time when you don't need it. Use that extra time with your weights instead.
Jack LaLanneWe don't know all the answers. If we knew all the answers we'd be bored, wouldn't we? We keep looking, searching, trying to get more knowledge.
Jack LaLanneAs it's often been said, the rest of your life is the best of your life. I'm reaching for your hand now to help you reassess your attitude on living and jump into the happiest, healthiest, most productive years you will ever have.
Jack LaLanne