The humidity doesn't get that high in Calgary,although we do see ~35C a few times a summer, more like an oven though very dry. I was in Nelson B.C, right on Kootney lake when it was 44C and ~90% humidty a couple summer ago. I felt it was the right time for a run so off I went, most of my usual aches and pains never materialized and my lungs felt great with the high humidty.