Cold, rainy weather makes my joints tight

any suggestions?

Just got done doing part of an inside work out - 1 set of 30 lunges, then I stopped those because it was hurting my knees.  So I did two more sets of squats against the wall with my exercise ball - they were much better, but all my joints still feel really stiff.  I think I will do push ups in a bit for biceps and back.  It's gross out today, and while I am LOVING the cold weather, the constant rain and puddles and mud make walking down to the work out room a work out in itself, so today will be all inside my apt.  Also, belly dancing tonight and practice for our group afterward.  Should be a great rest of the day; I just need to find a sweater now.  :-D