I used my HR monitor last night for the first time and went for a 1 hour ride. I had a standing rate between 75-85 bpm. Went out on the bike and stayed around 18 mph average with spikes up to 28mph or so. My heart rate average was around 155 and peaked around 172 bpm. Someone then told me that sounds very high for my age. I am 175 lbs and 26 years old. Am I way out of wack or is he?