I was somewhat hampered by my recovering left hip/hamstring, so I wasn't quite able to go all out, but my CHR test resulted in a CHR of 171 which translated to an MHR of 150. I was expecting it to be about 150 or 155 based on past tests and how my HR has been lately running at what I would consider marathon speeds. So, given that I would have gotten a slightly higher result if I were completely healthy and rested, I feel comfortable with the idea of using 150 to 155 as my target range (as if my MHR were 152.5) during my training. I've got 7 weeks to work with, which is why I tested today rather than resting a bit more before getting started. I don't want to waste any time since race day is so close.