Science Says THIS is the "Right" Amount to Exercise for a Longer Life

Just like eight hours is the magic number of sleep to aim for each night for optimum health, 30 minutes of daily activity is generally regarded to be a sweet spot when it comes to exercise and health. But if you can't swing that, you're supposed to at least hit the minimum recommended amount of weekly exercise: 150 minutes of moderate activity per week, which breaks down to 21 minutes of moderate cardio per day. General health and maintenance aside, how much exercise do you need to do t...