Walking after work is a kind of medicine. Blood pressure calms down about 30 minutes after the walk. Light exposure contributes to higher melatonin levels, which lets us sleep better. Oxygene and humidity purify the office and street dust we inhale during the day. It is largely free of charge for everybody and just needs some appropriate clothing. A rainbow is nice to admire, but it does come with some rain somewhere between the sun, you and the rainbow. The oak trees are admirable kind of trees. In spring they appear like sculptures with numerous branches out of branches. The big one on the photo below has a diameter of 125 cm, pretty senior to the others around. A flowery finish complements the walk after work in spring. As variant of the folk saying, I would suggest: Visiting your favourite tree every day keeps the doctor away. Of course I like my doctor, too.