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Hi, Could I ask how old you are please.
Well the reason your heart rate isn't getting up as high is because you've simply become fitter. Your body is now able to sustain your current level of exercise with much less effort than before.
To get it back up again you're going to have to start pushing it harder.
35. If I work even harder, there is still no change in rate whatsoever, until the monitor jumps to 224 (an error). If I feel my pulse it is fast and weak (I cant really count it because it is week). If I rest again, it will suddlenly drop again to 120 for about 20mins, before slowing back to normal