Fortunately this study seems to say you can have your cake and eat it too.
Whether running or weight training, high intensity exercise is much more fun that moderate intensity exercise. I started going to a personal trainer to build strength and pushing myself when running, and not only is it more effective, it's a lot more fun.
If you're walking 6 miles or biking 15 miles a day to commute, maybe that's not such a great idea. It isn't that much fun, isn't really much better for the environment, and it might actually shave a couple of years off your life. That sort of constant exercise isn't going to be very intense.
Whether running or weight training, high intensity exercise is much more fun that moderate intensity exercise. I started going to a personal trainer to build strength and pushing myself when running, and not only is it more effective, it's a lot more fun.
If you're walking 6 miles or biking 15 miles a day to commute, maybe that's not such a great idea. It isn't that much fun, isn't really much better for the environment, and it might actually shave a couple of years off your life. That sort of constant exercise isn't going to be very intense.