Another recent study showed heart health benefits of exercise increased with duration. 30 minutes a day of moderate exercise should be a minimum. In this study people exercising moderately 1 hr and 2 hrs per day showed 20% and 35% respectively fewer cardiac events. To understand this better you need to look at what moderate exercise is defined as: walking briskly, water aerobic, riding a bike on level ground or with few hill, pushing a lawn mower. Vigorous exercise can be thought of as worth double the amount of moderate exercise and includes: Jogging or running, swimming laps, riding a bike fast or on hills, playing basketball. When put this way it seems much more reasonable, 1 hr of vigorous exercise per day will reduce your chance of a heart issue by 35%. Heart disease accounts for 25% of deaths reducing your chance of that by 35% is significant.
Go out and exercise the way you like the best and do it frequently!
Dr. Nelson