Freed Australian journalist Peter Greste says meditation, running and studying helped him survive 400 days in an Egyptian prison.

A standing ovation welcomed the Al Jazeera journalsit to the Frontline Club in central London on Thursday where he spoke about his ordeal and hopes that colleagues Mohamed Fahmy and Baher Mohamed may be cleared at their re-trial.

They are now on bail pending their next hearing in Cairo on Monday.

The Al Jazeera English network journalists were jailed on terror charges in a case which the international community and civil rights groups denounced as a sham and an attack on media freedom.

Greste, who was released and returned to Australia from Egypt earlier this month, described on Thursday how he survived his 400-day ordeal.

'I have seen quite a few people in prison that were broken by prison. I felt I had to make a conscious decision to stay fit, physically fit, psychologically fit. The greatest danger is your own mind.'

He said he would start the day with meditation, would do some running and even started a distance master's degree in international relations.

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Greste tells how he survived jail