I was exercising half an hour a day before my POTS got worse about 6 weeks ago. It's too hard right now. I get so sick...I hope to be able to do it again soon because I can tell that my muscles are getting weaker. I'm trying for walking...I've gone from no walking at all 2 weeks ago to about 7000 steps in an entire day...on good days....1-2000 on bad days. Slow walking. All your comments inspire me to keep trying!