Interesting thing, the heart rate idea. Would a slow heart rate make you cold-natured or hot-natured? I remember going for my pre-separation physical while in the army, and after a 10-minute walk to the hospital in the middle of the day and maybe 15 minutes waiting my pulse was 44 (which got me sent up for an EKG.) Anyway, I guess I'm very warm-natured, because when I get chilly I turn the heat UP to 68 (it's normally at 60), and if it's warmer than 60 inside when I go to bed I find it too hot to sleep. If I do mildly physical work (like changing truck tires) in anything more than pants & a t-shirt sweat will be running down my face even if the air temp is in the low 50s. When going on runs in the wintertime while in the army, I'd have frost & ice on the outside of my hat & sweats due to sweat freezing. If summertime NEVER got about 65-70 I'd be perfectly happy.