been the case. i took your summer is nothing new to people who grew up here. it has been an issue ever since i was a child, but i have noticed it has got a lot harsher when i came home this year. that means that schools, coaches have to be extra careful to protect children playing sports outside. under the scorching sun of tokyo, girls from den en chofu high school s tennis club carry on with their extracurricular activities, but, every year, around 3,000 children suffer from heatstroke during club activities like this. there have even been deaths in the past. the school s tennis coach of 17 years says the hottest summers mean they have to be extra careful. translation: we measure heat stress indexes every hour to make sure - it is safe to practise. lately, we have gathered early in the morning at 7:15am or the late afternoon when the temperature