Heat acclimatisation only works if the athlete actually gets warm enough, for long enough, often enough. Without a number for it, that is a guess dressed up as a plan.
What Coachbox reads
Two numbers: your core body temperature and your skin temperature, both in degrees Celsius, both drawn next to heart rate and power on the workout. Coachbox keeps the average, the lowest and the highest value per session and per lap, so a heat block is something you can check afterwards instead of something you hope went well.
Nothing to connect
The sensor puts its values into the file your watch records. By the time the workout reaches Coachbox the temperature curve is already in it, so there is no account to link and no separate sync.
Prescribing by temperature
Once the number exists, a heat session stops being “ride indoors with the fan off” and becomes a target you can hold and check. You prescribe a range, your athlete holds it, and afterwards you see how much time they actually spent there instead of how hot they remember feeling.
