Originally Posted by
ColinL
then it is likely that your max HR is higher than 199.
there are a few highly efficient people out there who don't conform to the chart you embedded, but for most, when zone 4 & 5 are easy that means the HR you are computing from is too low.
even when I plug it in with a 203 max or 205 its not that much different. I don't think your zone 3 or 4 should feel like your "hammering" by any means. Those zones are cruising to me. Again, its all in conditioning.