Jai, 6, has raised more than $1200 by taking part in the Jump Rope for Heart fund-raiser.

Through Jump Rope for Heart, students improve their strength and confidence by playing lots of skipping games.

They ask friends and family to sponsor them, with all funds raised going towards the fight against heart disease and stroke.

Jai's father, along with two of his three siblings, have been affected by restrictive cardiomyopathy, which stops the heart from filling with blood properly.

They cannot perform excessive amounts of exercise.

After hearing at school about the Jump Rope for Heart campaign, Jai wanted to raise money so his dad and siblings, and others like them, could get better.

He raised more than $700 in the first 24 hours, largely due to a Facebook page he set up with the help of his father, Lucas.

Jai also made his own skipping rope from a piece of rope he found.

More than 600 schools in NSW participate in Jump Rope for Heart every year, raising about $4 million annually.

Hunter Christian School has raised more than $15,000 the last three times it has participated.

■ Go to jumprope2014-hunterchristianjuniorschool-100305.everydayhero.com/au/jai to view Jai's fund-raising page.

* Jai's last name has been withheld.