Some card or board games. Especially relatively easy ones to help with the inevitable “what were we doing?” situation.
Soms to ask each other fun and thought provoking, even philosophical questions.
Or fuck that and just put on a compilation of funny videos and before you know it’s Monday again.
Assuming you work from home the real answer is that you just get up every few minutes and move. It doesn’t matter what. Some squats, pullups, pushups. Even a few hundred steps works wonders.
The key is to make the barrier to entry as low as possible. Then you actually do it more often.
Besides that, find a sport you think would be fun. Just try a bunch of trial lessons or join some people you know.