Meant to add...for what it's worth, I never got into running, either. Seemed if I got a pace fast enough to not kill my knees, I'd quickly get to my overheated state (even if indoors). With my bike I can manage a pace that keeps me below this line (it helps that I live in a flat area). The fact that it's super-hot here now makes it trickier. I went out at 2:00 in the afternoon a couple of weeks ago, which was a big mistake. If I stick to the mornings, I'm pretty much ok.