Share 'Heat stress and HR zones'

Hi! My name is Tomer, and I lately started training toward the Israman IM at the end of January 2010. Though at this early stage I’m still undecided on whether I’ll go for the half distance or the full deal, I’m now on the 5th week of the ultra distance program. Usually my favorite training time is early morning. But with most days having double sessions, I find myself training quite a lot at...