Outside is Planet Earth. Inside is warm. Outside there are mountains, forests, deserts, bumpy tracks. Inside are comfortable chairs. Outside is perspective. Inside is Google and Facebook. Outside is full of weather. Inside is big-screen TV. Outside is wood to be chopped, snow to be cleared and a dog who wants a good long walk.
Outside is where Hunter-Gatherer 21C spends a lot of his/her time.
Of course inside is tempting; but outside is where we need to be sometimes to allow ourselves to grow in all dimensions. To live life long, wide and deep. To use our hands, to understand love, to observe and to allow us to sleep well.