Up north we have to deal with cold weather. I have a hit away and a modified zip and hit set up in the basement with a couple of pieces of exercise equipment. We push all that to one side and do catching and infield fielding drills. In the garage, where the ceiling is higher, we do medball work and front toss with wiffle balls. Upstairs we have a pull up chin up bar, an exercise ball and some resistance bands attached to a closet door hinge. Where there is a will, there's a way. I even have the kids throwing a real ball in limited space using a sock drill. When we can get cage and mound time, we do, but the majority of the work is done around the house with screens, wiffle balls, tennis balls and other modified equipment.