So I had been riding my bike a lot, but not really keeping my heart rate up. What I have been doing lately is I do not stop pedaling, and try to keep the pace constant. It is a lot harder than the way I was doing it before, but it is getting me into shape quickly. Something I'm wondering about though is a blood taste I get after prolonged periods. I haven't really had colds or sinus crap lately, although it seems like my sinuses are constantly slightly clogged. When I get this blood taste there is above average mucous production.