Reply: That 30 to 60 minutes of exercise 3 times a week can't be right! There is no way. I tried that and it does absolutely nothing for me except waste my time. I didn't have any muscle build, calorie burns that were worth noting, nor any real challenging (to the cardiovascular system) aerobic workouts. This is like the food pyramid the government put out: it is worthless and will probably in the long run make you less healthy, not more healthy. I mean, geez, it takes me 15 miles cycling to even begin to get warmed up and have the power and speed kick in. Personally, I think the minimum should be 60 minutes per day, 6 days a week. Hey, is anyone listening to anything the government tells you any more? Do what you know works for you.