It is funny you mention this, as I am currently in USF’s Heat stress chamber conducting a research study on measuring physiological changes to different thermal conditions. I would not say there is benefit unless you are planning on performing functional tasks in this type of environment. The purpose of our studies are to determine the safe work zone for a certain employees or athletes to participate in their event at. For example – a football player in the heat. So I would say there it is not directly beneficial unless you will encounter this type of atmosphere within your life.
Fuel the Movement,
Personally, I would avoid training in a hot environment unless the client had a specific need for it. I would never recommend it for a debilitated or obese client.
Hyperthermia and dehydration can strike quickly and can be fatal!
If you need to train in a hot environment, make SURE your client is cleared for such activity by a doctor, they are properly hydrated before starting, they stay hydrated and keep a very close eye out for signs of heat exhaustion or heat stroke. Make sure you have a phone close at hand in case you need emergency services or, if training a group, see if you can have EMS on site.