Dr Hilary Jones spoke to Good Morning Britain hosts Adil Ray and Ranvir Singh on Wednesday's show about the new study that says that Britain is the worst country for Europe for inactvitty.
"Laziness has worsened in Britain more than any other European country, they are saying sedentary behaviour among adults has increased by 22% between 2002 and 2017," explained Ranvir.
"And that's not counting the fact that this year we have not done anything, we've been pretty sedentary anyway."
Hilary responded: "Our sedentary behaviour is defined as spending four and a half hours or more sitting down every day.
"We are sitting down, watching box sets, using our smartphones, we're not moving around much.
"In my practice, I see a lot of people as they get older, and people can get very old, the one thing they regret is their immobility.
"Not being able to move to get to the places they want to go, to be able to walk.
"When people are young, they should be using their bodies to move as much as possible, they will regret it if they don't.
"Our bodies are designed to move, when we don't move it affects our heart our cholesterol rate, our blood pressure, it stores up problems for arthritis, diabetes, everything.
"We should be moving a great deal more - move more and sit less."
Hilary also discussed the new advice for students to wear face coverings in school corridors, and said it could be used as a biology lesson in practise for students.
"It's actually a very sensible biology lesson, it's teaching children about the germ theory of disease, it's teaching them about how germs are spread, about the importance of hygiene," he said.
"Masks and face coverings and other measures don't just protect against COVID-19, they protect against seasonal flu, other bacteria, other viruses, it makes sense for them to understand their hands transmit viruses."
He added: "It's not just about respiratory disease, it's about hygiene in the kitchen as well, preventing food poisoning and the handling of food.
"It makes for the perfect lesson, it's not ideal circumstances but there is a positive to it that this generation can take forward."
* Good Morning Britain airs weekdays on ITV at 6am
