As some of you know I've started heart rate training. This past weekend I ran a 5k race slow as expected. I was getting quite frustrated as even though I was running slow (4.5 mph), I was still stopping to walk as my heart rate exceeded 150 bpm. This seemed to happen even 20 yards or so until 2 miles in I tried holding the chest strap against my chest. At this point I was able to run again without stopping as frequently. My advice to anyone else which I have found to help with the chest strap is to adjust the strap and then use a safety pin to lock it in place. I guess the plastic buckle loosens up over time. Also, I'm curious as to any reviews from other runners that use wrist strap based heart rate monitors as to what watches are good and bad. Thanks in advance.