I do, but that's on a very random basis and I still dont know if I have to blame Spiro, Estradiol, full moon or those episodic days when I feel weaker than usually. I had weeks when I was jogging 3-4 times per week, doing about 8-9 km each time with one or two stops, or without any - all on Spiro. Then I got other days when I could not complete the distance because I got puffed out, or I was making 5-6 stops and still puffed out...