First of all I'd like to say hi to everyone as I am new to this forum, and to say sorry for my bad English.I'm 29 male from Poland,5'8.1" and 151 lbs.I started running about a year ago in addition to quit smoking. My typical week includes about 4 running days, 3 about 5km, and 1 longer run about 8km. I've found this forum when I was looking for the hr based training plan. I calculated my MAF HR as 180 - age which gives me number 151. The problem is I can't keep below this HR even when I jog slow. When I just walk my HR can't go over 130, and mostly it is about 120 to 126. But when I try to jog, my heart rate spikes to about 145 and then raise gradualy to about 160 or even 170. I can walk all day with this 120 bpm HR but can't run/jog with hr = 160 longer than an hour. So my questions are:1) Are these hr rise sign of underdeveloped aerobic system?2) What can I do to help improve my training? Thanks in advanceWojtek
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