Originally Posted by Seattle Forrest

Sure, but it's more than that.

You heard you should work out for at least a half hour, as hard as you can, so that you can barely have a conversation above the gasping for air. To the point that you'll have trouble standing up when it's done. Why do you think people don't just do a workout like that every day, maybe once in the morning and once in the evening? Because they can't.