I know the formula for figuring out your heart rate but does that alway ring true heart rate? I was running the other day with a friend and his heart rate was 142 and mine was 186. I know it goes according to age ,sex and weight at least that is what I had to program in for my heart rate monitor. I was working hard but was able to hold on a conversation and I ran 11miles with my heart rate at that number. He said he wouldnt be worried unless I couldnt carry on a conversation. I also know that just walking around my house that my heart rate is in the 90's,so I have a normally high heart rate anyway. when I figure out my target heart rate according to the formula it say my max is 156 or so. should I worry about training in the 180's or can that formula be off for some people? this is without adding your resting heart rate in also. I have read something about figuring that in which will get you a higher target rate than without it. anyway and help I could get with this will be appreciated. I dont really want to slow down with my runs as like I said I can sustain them in that zone. thanks