Obviously for Northern Hemisphere folks here. Where I am, it has been mostly below freezing, a little snow but not enough to pe pretty or good to play in. It’s mostly indoor activities. I work out at the gym, play board games, have random get togethers with friends. What do you do?
XC skate skiing when there’s snow, running with spiked shoes when there’s not. Dark when going to/from work usually, so getting out in the weekends is important. Walk/run in the middle of the workday is great, but something that I don’t do nearly enough.
D vitamins. I also have a daylight lamp at work, but haven’t started using it yet.