We know if you step outside on a cloudy day where the dry-bulb temperature is minus 10, it feels very different than on a sunny day where it's minus 10 but you have the solar load.

Mike Tipton

It's difficult to keep taking stuff off, putting it in your rucksack, then putting it back on, the urge to keep going is enormous. But you have to fight that urge and just do it.

If your blood sugar falls too far, you'll lose your shivering ability and your perception of cold, you'll tend to think you're warmer than you are.

Olympic organisers must take the warnings in this report seriously or face a real risk of competitors collapsing through heat exhaustion, in a sporting context, a hot and/or humid environment can represent a risk to the performance and health of spectators, officials and athletes. From sunburn, through cognitive impairment, to heat exhaustion or collapse from heat stroke, all facets of a sporting event -- and all those involved -- can be adversely affected.