A couple of weeks ago I dared myself to take a ride in a heatwave. Around midday. In 41C heat.
I tried to make it as intense as I could, but I made it a point to turn back as soon as I felt I should. I drank half the bottle and used the other half to keep my head wet.
The trip turned out to be as short as I thought it would - a nine-km round trip. By the time I was back at home, I was done. But it felt great to know where the limit was. I probably won't be attempting to push at the limit soon, but it's on the bucket list.