I have been struggling as well. I really only like to exercise outside and air quality has been awful here too. The humidity the past couple of weeks is miserable. I have forced myself to do DVDs at home and I found a place to walk at lunch that is indoors with lots of stairs. I am supposed to start training for a half marathon this week, but not sure how I can run outside with this heat. I hate the treadmill, but I may have to suck it up.