Last night I hopped on the trainer for an hour to do some intervals. After warming up I start going hard. Once I get to the point that I feel like dying I look down and see my heart rate is only in the 170s but I feel like I can barely go any harder. After a few more 1 minute intervals my hr stays the same so I switch to 5 minute intervals and my hr is only in the 160s but again im feeling so beat.
Stuff like this kills me. My max hr is something like 190. When I cant even get in the 180s when i think im working really hard i start to ask myself what the heck im trying to do.