The Olympic environment is so often described as a furnace, such is the intensity of the spotlight on every athlete throughout the two-week extravaganza.

This year, however, a furnace is a fitting way to describe the heat and humidity the athletes are playing in.

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The official temperature is in the low 30s, but thermometers at various venues have soared past 50 degrees over the first few days of the Games.

Athletes from a raft of sports have complained about the heat, with triathletes collapsing one-by-one after crossing the finish line in Monday morning's mens race.

Australia's hockey players have had no issues navigating the intense heat, both sides now two from two.

On Monday it was the Hockeyroos who thrived at Oi Hockey Stadium, recording a resounding 6-0 victory over China.

The match marked the second-straight day the team has played during the middle of the day, players utilising ice packs and mist fans in their efforts to remain cool.

Australia spent a week in Darwin before travelling to Tokyo and the early results indicate the camp was successful in helping the side acclimatise to the intense heat.

For goal-scorer Ambrosia Malone, the team's fitness is what can set the side apart from their rivals.

"It's just all the hard work and training that we've done throughout this period leading up to the Olympics is paying off," Malone said.

"Theres' a lot riding on these games with our fitness. Fitness is a massive thing and that's been our strength, to kind of keep on rolling over teams and working right until the very end, so that's kind of the biggest thing in this heat."

The clash with China was an even affair through the opening 15 minutes before the Hockeyroos steadily took control of the match.

Two goals in the second quarter put the team in a commanding position at half-time and they went on with it after the break.

Brooke Peris scored just 29 seconds into the third quarter, with Australia adding a further three in the fourth, including one to Gerringong's Grace Stewart, to close out a dominant win.

While the Hockeyroos were full of running throughout the second half, the Chinese were unable to keep up with their fitter and more skilful opponents.

Perhaps the only disappointment from the match was Australia's struggles from the penalty corner, the side zero from five.

Overall, however, there is much to like for Hockeyroos coach Katrina Powell as the undefeated team looks forward to a day off on Tuesday before a clash with Japan on Wednesday night.