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Just bought a Garmin 410 which has a heart rate monitor and used it for the first time tonight. I started it just as I started running and did 4 miles when I came to look at the analysis afterwards was shocked to see my starting heart rate was 108! It got up to around 173 maximum whilst running but when I was walking at the end to cool down the lowest it got was 107 is this normal? I am 30 years old and although I have only started running recently I have taken reguar exercise for years (combination of kick boxing and aerobic activities).