One more time Paige !
I also read in the article that you should train in a range of 75 to 85%. I'm a little confused because when I walk I have a Heart monitor on all the time. When I'm walking I pick up my speed until I feel like I'm getting a workout. My breathing actually feels normal and I'm having to inhale through my nose and exhale through my mouth. I having to force myself to breath hard and my heart rate runs around 140 to 143 and my the calculations I should not go over 130 BPM.
Again with the calculation 85% om my Max THR is 130.
My exercise today was to walk 3 miles in 40 minutes 49 seconds. My polar heart monitor says I burned 574 calories and 35% fat. My max HR was 149 and my average was 141. During my walk I stayed in My THR zone for 36 minutes 26 seconds. My THR zone is 130 to 145 BPM.