The NHS rewards people who walk 30 minutes a day

The aim is to register more than 100,000 people, with daily statistics recorded digitally.

If the target is hit, it will be considered the biggest marathon in history, Sir Brendan said.

As seen in Snapchat and Duolingo, the culture of detail, the habit of creating behavior, helps people rise to the challenge.

The health benefits and NHS savings will also be significant.

“If someone walks for 30 minutes five times a week, they can add up to four years of healthy life,” he says.

Sonya Pombo, head of research and impact at Action on Salt & Sugar, said: “Encouraging people to build regular activity into their daily lives supports better health, and making it easy, accessible and rewarding can help more people get started.

But we cannot rely solely on individual behavior change. If the government is serious about improving the health of the country, especially for children, it should combine such measures with strong preventive measures.

Full details of the voucher scheme will be released in the coming months, along with information on how to sign up.