Not much space you have there. But, you have a bed. I suggest trying wrestling! It sounds funny, but it can be a serious workout. I mean the Greco Roman style. You don't have to stand. Your bed can be the limits(boundaries.) It's all about pressure, strain, push, pull. And it can be a lot of fun, and produce laughter. Second choice, pillow fights. Thats another proven workout, that's fun!