Wales head coach Warren Gatland has hailed the facilities used by the squad during their training camp in Qatar.
Gatland's 47-man group have now returned to the UK after a nine-day session overseas.
The camp was the second Wales have done to prepare for the Rugby World Cup following a stint in Switzerland.
Gatland spoke highly of the reception and care his players received while training in Doha and was pleased to put the players through their paces in a different setting.
"Training in Doha provided our players with the challenge we were hoping for," said Gatland.
"The welcome and facilities on offer in Qatar were excellent and combining the facilities with the weather and the heat has meant we have got the benefits we were looking for.
"We wanted to take the players out of their comfort zone and place them under heat stress and we certainly got that.
"The players have had to dig very deep during the last month. We have come away from the two camps incredibly impressed.
"We know we have pushed them physically and mentally to the limit."