Repeated use of saunas could help people cope better in heatwaves, scientists say

Experts say heat training typically takes 40–60 minutes of heat exposure each day for four to six days, with the benefits lasting for about a week. Photograph: Compassionate Eye Foundation/Richard Boll/Getty Images

Even as summer temperatures soar, the sauna trend is booming, with some venues touting them as a way to beat the heat. But while experts have urged caution about sweating it out in hot weather, a growing number of studies are considering whether heat training could help people prepare for heatwaves.

With parts of the UK experiencing their fourth heatwave of the year, the UK Health Security Agency (UKHSA) has issued heat health alerts across much of England. The warnings follow an unprecedented summer, with western Europe experiencing its hottest June on record.