Hey Medical Monkeys, I was wondering what your thoughts are about hitting and staying around you max heart rate. I guess the main thing I'm wondering is: is it dangerous to hit & stay maxed out for an extended period of time? My MHR is 206 and I'm 28, so you can tell that is a pretty high HR for someone my age. Last night I was racing and hit and stayed at 203 for about 2min. I know they say your heart is a muscle and should be worked out, but other muscles can get sore and sometimes hurt if you work them out too hard for too long. Thoughts? What are other monkeys Age & MHR?