So I would consider myself a decent runner, did a half marathon in sub 2, usually top 5 of my AG in tris, but I have issues training with heart rate zones. No matter how slow or easy I am running I can't keep my heart rate beneath the high zone 3 low zone 4. I can walk and get it into zone 1, but the moment I start running it just sky rockets. I'm not breathing hard at all so what gives? I refuse to walk but I would also like to keep up my training in heart rate zones (oh yeah have no issues doing this on the bike usually).