Data suggests there's a certain number of minutes you should aim for to improve your cardiovascular health. Here's how you can sneak them in. Walking is a powerful tool for both our physical and mental health ― perhaps even more powerful than we think. Walking an estimated 21 minutes a day can reduce your risk of heart disease by 30%, according to a Harvard Health special report published in 2017 that has been used often to underscore the importance of going for a walk . The report also