Poor physical fitness has a lot of disadvantages and a new comprehensive review of studies has now warned that because of record levels of obesity and physical activity among children, they are set to bear the brunt amid rising global temperatures. 

While physical fitness is key to tolerating higher temperatures, children are more obese and less fit than ever before, argues Dr Shawnda Morrison, an environmental exercise physiologist, from Slovenia's University of Ljubljana.

This could put them at greater risk of suffering heat-related health problems, such as dehydration, heat cramps, heat exhaustion or heat stroke.