How high do you let your hr get.I can hold mine at 154-164 for 49 min(as of today-increasing 1 min everyworkout) that is 82%-88% according to info I inputed onto hr monitor -not the formulas with resting hr.I can't get my hr down to the lower zone.Do I need to set the hr for the heavy work load or leave it at medium does it make a difference.I feel good running with this hr but feel it may be a little high.so I was wondering where you keep your hr.FYI-I have just started running endurance instead of sprints about 2 months ago.I still do sprints sometime mixed in.I know there are alot of factors that affect the numbers but I would really like to know where everyone else is.plus the hr monitor is somewhat new also.TIA



