MORE than 1000 CrossFit athletes and fans packed into the Ipswich Indoor Sports Centre for the annual Battle of the Switch over the weekend.

More than 350 competitors, including over 30 teams, took part in the event which was being held indoors for the first time.

The event was moved indoors after scorching temperatures in Limestone Park last year made some equipment too hot to handle.

Battle in the Switch spokeswoman Catherine Brown said the growth of the event was amazing.

"We've just had such a great response this year," she said.

"We were expecting about 800 spectators, but it seems like more than that. I'd say there could be 1000 people here just to watch.

"CrossFit has really taken off over the last few years."

The competition took a charity focus on Saturday as Jamie Zimmerman from the Australian Hero Games led a campaign to raise money for the Commando Welfare Trust.

Mr Zimmerman said he had developed Crossfit workouts for charity in honour of friends of his who were killed serving.

"Combining CrossFit, defence and charity is something that's worked really well for us," he said.

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