What type of exercises would you do if you’re on a sailboat and it’s still a bit to cold to go swimming?

I would do exercises that do not take up a lot of space. For instance… squats, crutches, planks, you could probably do some cardio like jumping jacks, high knees, running in place, etc. I have never been on an actual sail boat besides a small boat for riding around in so I don’t actually know what exercises would be best but I hope that this was sort of helpful.