That is because the 11-year-old is bouncing on a pogo stick every spare moment he has, as part of his training regime to pogo stick up the world’s steepest street.
The marathon effort will take place in Baldwin St next Thursday (weather permitting), with the aim of raising funds for Ronald McDonald House in Christchurch.
Harry said the organisation was close to his heart because it provided his family with support and "a home away from home" when his sister Darcie was receiving cancer treatment last year.
Many have tried to climb Baldwin St in weird and wonderful ways, including on stilts, rollerblades and a penny-farthing.
Harry said he chose the pogo stick as his means of transport after playing with his brother’s one.
"I started pogo-sticking a couple of years ago when my brother got one for Christmas.
"I had a go on it. I was like, ‘I’m really good at this’, so I just decided to do this."
Fortunately for his brother he got his own pogo stick.
"I’ve been doing training on my driveway at home and sometimes I come out here [Baldwin St] and do certain bits of the street — I do the steepest bit and then I do some of the lower bit.
"I’m pretty confident I can go right to the top. I think I might stop once or twice but I’m going to try and do my best to get up it all in one go."
He said he had raised about $1100 for the charity already, but hoped to raise more than $2500.
It seems Harry has some business nous. He had timed his attempt to coincide with a cruise ship visit, so there would be more people on Baldwin St to give to his cause, he said.
His father, Stephen, said when Darcie was at her worst, she had tumours on her brain, both her ovaries, both kidneys, pancreas and in her bone marrow.
"She was pretty crook, so we didn’t think we would be bringing her home when she went to Christchurch.
"So we’re pretty lucky that she got through it."
Having the family stay together and visit Darcie in hospital regularly played a major part in her recovery.
