What’s the most reliable indicator you should use when determining if you should modify activity for heat?

Explanation:

Humiture is an indicator that combines air temperature and humidity, to help people to perceive an equivalent temperature in certain environment. In addition, we have a temperature number, but that is not enough to determine how it feels the temperature, because humidity changes the sensation of the actual and numerical temperature, that's what it means "apparent temperature" but it's real, because is the temperature our body perceives.

So, a good indicator to modify the activity for heat is Humiture, because allows to know how intense would be the heat, not just the number.

im 100% sure its all of the above.