For slow running I find that wearing my HRM and strictly telling myself before and during that I need to stay under 140bpm really helps. For faster sessions I disregard HR and just look at pace, but for all other runs the HRM is invaluable at keeping me in check (it's amazing what you 'think' is easy pace versus what is actually easy!)
Reminds me I forgot to buy the bloody Polar arm strap - My Garmin 945 monitor is rly annoying me as its inaccurate which for a £500 watch is pretty disappointing
For slow running I find that wearing my HRM and strictly telling myself before and during that I need to stay under 140bpm really helps. For faster sessions I disregard HR and just look at pace, but for all other runs the HRM is invaluable at keeping me in check (it's amazing what you 'think' is easy pace versus what is actually easy!)