Winter break = no gym access

noblesseoblige

So I'm in college and I have free access to a gym here, but when I go home I won't have any access to a gym and I'll be home for a month. I was wondering what kinds of exercises I could do at home?

Also I can't really run, it triggers my asthma too much and its really cold out. I don't have any equipment, other than a very large exercise ball. And very little space to work out.

Any suggestions would be greatly appreciated!