Do your cardio outside added benifit!!!

I know we live in a technological society that is all about machines, Technology and gadgets but sometimes older is better. For instance if you run out side vs. running on a treadmill it is harder. Do you know why? The reason is because you are moving %100 of you weight with your muscles. If you use a treadmill the ground is moving under your feet which is helping you to move forward. I am not saying to abandon your cardio(aerobic exercise) if you like to use machines. All I am saying is that change is good and you will get a better workout by running outside at least every once and a while. Plus you get all the other benefits of running outside like the sun and fresh air. So I would encourage everyone to get outside and take advantage. Get the most out of your aerobic exercise.