The inquest into the death of Corporal James Dunsby heard that he suffered multiple organ failure after collapsing during a training exercise on one of the hottest days of the year.
Cpl Dunsby was one of six soldiers who collapsed during the exercise, on July 13, the court heard.
It is thought that the reservists were taking part in an exercise known as the "Fan Dance" which involves marching up South Wales's highest mountain, Pen Y Fan, and down the other side carrying a weighted pack and rifle, then doing the same route in reverse, in a set time.
More top news
Some of the world's biggest football clubs will ask FIFA to move the 2022 World Cup to spring.
After saying she wanted "just a card" for her birthday Betty Musker is celebrating her 104th with over 6,000 cards from around the world.
This photo of African migrants attempting to cross the border into Europe while golfers tee off has gone viral.