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 LaLanneFocus on your problem zones, your strength, your energy, your flexibility and all the rest. Maybe your chest is flabby or your hips or waist need toning. Also, you should change your program every thirty days. That's the key.
Jack LaLanneYou start out with an hour on the treadmill, then another hour of lifting - hell, in two weeks you're not doing anything anymore. You gotta be reasonable.
Jack LaLanneIf you've got a big gut and you start doing sit-ups, you are going to get bigger because you build up the muscle. You've got to get rid of that fat! How do you get rid of fat? By changing your diet.
Jack LaLanne