Harrison Sealey, 21, said he was shocked when he learnt that his rather Graham had suffered a stroke after first learning his grandfather John had also suffered from one.

He said his father, a policeman in Portland, was "one of the fittest people I know".

Mr Sealey, 55, regularly participates in walking marathons and other charity walks.

Prior to his stroke he had no health problems.

"It was his first day of holidays and he got up early to go and work on something in the shed," Mr Sealey said.

At breakfast he complained to his wife Lisa about a severe headache.

When his wife saw the telltale signs that he was suffering from a stroke, she called for an ambulance.

Mr Sealey was rushed to South West Healthcare's Warrnambool Base Hospital and was later flown to Melbourne. His doctor told family members he would be in hospital for a number of weeks and then needed to remain in rehab for another couple of weeks.

However Mr Sealey told doctors he would only need to stay a few days.

And he proved them right.

Mr Sealey said his father and grandfather were now recovering well.

"Doctors have told dad he will probably make a 95 per cent recovery," he said.

Mr Sealey, who is a keen BMX rider, decided to do something to raise money for the Stroke Foundation.

"Dad has always been very involved in his community and has walked from Melbourne to Portland on many occasions to raise funds for charity," Mr Sealey said.

"I decided it was my time to pick up the baton."

Mr Sealey has been riding each day on tracks around Melbourne, clocking up 122 kilometres on his best day yet.

He has raised more than $3500 and has a goal of $5000.

Mr Sealey said he was shocked to learn about his father and grandfather's strokes - especially so close together.

"I'm aware stroke can be fatal and is a leading cause of disability, so it was really tough on my family in the early days when we didn't know what the impact would be."

When a stroke strikes the brain, the human control centre, it can impact everything we think and do. Mr Sealey said he had been delighted with the support he had received. He said he first set a goal of $1000, which he surpassed days after posting his intention to start the ride.

"I have been overwhelmed by the support from family, friends and my work colleagues for my fundraiser so far."

Stroke Foundation Victorian state manager Eamonn O'Toole applauded Harrison for his determination.

"It is heartening to see a family member want to make a difference for others," Mr O'Toole said.

If you would like to support Mr Sealey visit https://doit4stroke.everydayhero.com/au/ThousandKsIn30Days.

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