I go buy some fresh food/vegetables at the store every day, at the very least. Initially, my wife didn't get why I went shopping every day "just go once and get more stuff!", but then she figured out that it's the only time I get out of the house and doesn't mind. It's nice to have fresh stuff in terms of fruit and vegetables and we waste less because I only buy what we need.

Some actual exercise and/or interaction with other people is probably better though - during the summer I got out mountain biking pretty often.