A survey has found Americans spend over 90% of their time indoors. it's important to spend more time Outdoors. However this is not always possible for some people with special needs. Also during the winter and on rainy days Outdoors is not the preferred option.

So we include Recreation activities that can be done both outdoors and indoors because when you can't get Outdoors to a park your home becomes your Park

modern Americans have been taught to be an indoor species. But that is not how we evolved other modern cultures spend less time indoors than we do and I suspect ancient cultures spent a lot less time indoors. we evolved for millions of years as an outdoor species it's only in very recent times that we've become cave dwellers and I suspect our bodies haven't acclimated themselves to this yet. Get yourself outside more!