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From a curly-haired toddler who shared his father's love of fitness, to a far-right mass murderer who killed 49 people - the life of Brenton Tarrant, 28, has been revealed. 

Tarrant, who live-streamed himself shooting inside Al Noor Mosque in Christchurch on Friday, grew up in Grafton in New South Wales' Northern River region.

In a chilling 73-page manifesto called 'The Great Replacement,' which he penned prior to the killings, the 28-year-old gave insight into his upbringing and background.

In his own words, Tarrant described himself as an 'ordinary, white man', who was born into a working class, low income family of Scottish, Irish and English decent.

In the manifesto, he said he had 'no interest' in attending university after leaving school. His father died of cancer when he was in his early twenties, and he left Australia to travel the world shortly afterwards.

He appears to have made money trading Bitcoin, and then spent some time travelling the world from 2011 onwards, when he visited countries including North Korea and Pakistan as well as Europe. 

A woman who knew Tarrant after he left school told Daily Mail Australia that he seemed like an unremarkable man when he worked as a personal trainer, and suspects he was radicalized in some way on his travels. 

Brenton Tarrant is pictured as a child being held by his keen athlete father who died of cancer in 2010 at the age of 49 He grew up in Grafton in New South Wales' Northern River region and worked as a personal trainer before leaving to travel the world

Tarrant grew up in a picture-perfect house (pictrued) in Grafton in New South Wales' Northern River region

His father, Rodney, who was a competitive athlete, died of cancer in 2010 aged just 49 and his mother and sister are rumoured to still live in the area.  Rodney is pictured wearing a Gold Coast marathon t-shirt while 

While it remains unclear whether any of his relatives - including his mother - still live in the area, the family is very well known in the region, ABC News reported. 

The 28-year-old wrote that he had 'little interest in education' growing up, and did not attend university as he had no great interest in anything offered at the schools.  

He claimed he made some money investing in Bitconnect - a type of digital currency - before he then used the money to travel overseas. 

Tarrant, who would later go on to become a personal trainer, inherited a love of physical fitness from his father, who reportedly died of an asbestos-related illness. 

A woman who claims to have previously known Tarrant through the gym, confirmed it was him in the live stream.

The gym manager, who does not wish to be named, told Daily Mail Australia that he followed a strict dietary and exercise regime and worked at the gym after he finished school. 

Ms Gray said Tarrant always 'threw himself into his own personal training' before he later became a qualified a trainer and started training others. 

He was very dedicated to his own training and to training others, she said. 

In his manifesto, Tarrant (pictured) described himself as an 'ordinary, white man', who was born into a working class, low income family of Scottish, Irish and English decent

A man who identified himself as Brenton Tarrant (pictured) live-streamed the massacre of dozens of people in Christchurch, New Zealand

She said while he was very dedicated, he was more dedicated than most people would be.

'He was in the gym for long periods of time, lifting heaving weights. He pretty much transformed his body,' she said.

The woman also said she had not spoken to him or heard him talk about his political or religious beliefs.

'From the conversations we had about life he didn't strike me as someone who had any interest in that or extremist views,' she said.

'But I know he's been travelling since he left Grafton. He has been travelling overseas, anywhere and everywhere.

Three shootings have taken place in Christchurch on Friday afternoon, two at mosques and another at Christchurch Hospital 

'I would say it's something in the nature of his travels, something he's been around.

'I know he's been to lots of different countries trying to experience lots of different things in life and I would say something's happened in that time in his travels,' she said. 

Tarrant is believed to have travelled to Europe, South-East Asia and east Asia.  

In a previous Facebook message about a trip to Pakistan on Facebook, he wrote: 'an incredible place filled with the most earnest, kind hearted and hospitable people in the world,' The Sydney Morning Herald reported.  

'The beauty of hunza and nagar valley in autumn cannot be beat,' he stated.  

Witnesses reported hearing 50 shots and police are responding to the incident at Al Noor Mosque in Christchurch on the country's South Island. Pictured is a still from a live-stream of the shooting

In his manifesto, Tarrant stated he first planned the attack 'roughly two years in advance' but chose the final locations three months ago, The Sydney Morning Herald reported. 

He said he initially planned to target a mosque in Dunedin, but changed to the Al Noor and Masjid Mosques because they had 'far more invaders'. 

He wrote about how after attacking those two mosques he planned to drive to a mosque in Ashburton, an hour south of Chirstchurch.

'I am unsure as of this time of writing whether I will reach that target, it is a bonus objective,' he wrote.

Forty-eight people are believed to have suffered gunshot wounds during the attack, with hundreds of family members currently on site at Christchurch hospital.