The point of exercise is to make you feel better later. It rarely sounds good in advance. Yesterday was 40C/100F and I thought I might skip my Friday afternoon golf, but I stayed out there for 5 hours practising and playing (didn't get sunburnt at all, which is some kind of record) and now I feel great. I slept so well and have that wonderful afterglow from having done something productive. These people think everything should feel amazing all the time.