This is very strange, normally when i run i go into the red heart rate zone which for me is over 170 on my Garmin watch , i get winded and its tough so after a recent bout of flu i decided to go out and stay in the "threshold" range , so around 168.
It's weird I'm running faster, my times are dropping, i could hold a conversation and i feel like i could just keep going. Has anyone else found this or have an explanation.