I don't really have a precise routine during winter, as the chances to have a ride depend on the weather and how it affects the arena, but I see my boy about 5 times a week, and then do whatever is possible - be it groundwork, trails or flatwork. No jumping, though, the terrain is too slippery.
When it is possible to jump, I fit it in between two days of training, for example -
Monday - light flatwork with lots of stretching, possibly bareback, or groundwork
Tuesday - day off
Wednesday - light flatwork, groundwork or trails
Thursday - day off
Friday - flatwork
Saturday - active trails, endurance training
Sunday - jumping
I never leave a day off before or after a jumping session, so that his muscles and joints are already prepared for it during the previous days, and are allowed to prepare themselves for a day off.
I have come a long way, to surrender my shadow to the shadow of my horse.