The plan was to do drills on a grass field. See my blog for details of the drills video. I jogged 3k to warm up, and did a selection of drills. It was much later in the morning than usual, and the temperature had climbed to 40C 104F. I was going to jog another 7k for a total of 10, but in the heat (open field, no clouds) my heart rate started to take off. So I gave it away for the day ...