I went on a group ride yesterday with some heavy climbing (for me at least) and when I get back Training Peaks has suggested a new Threshold HR based on my ride. I'ts up 5bpmcompared to my previous LTHR. I noticed quite a few times yesterday that my HR was in my Threshold zone but I didn't feel like I was working that hard. Should I believe this new LTHR and adjust my zones or just keep it how it was?