A report by the British Heart Foundation suggests that more than 20 million people in the UK are physically inactive.
The charity raises concerns about inactivity, saying it costs the NHS around £1.2bn each year and vastly increases the risk of heart disease.
The report found that women are 36 per cent more likely than men to be inactive, with 11.8million women meeting the criteria, compared with 8.3 million men.
Within the report, "inactive" is defined as not meeting guidelines set out by the government for physical activity. These are currently set at 150 minutes of moderate exercise per week, as well as strength activities on at least two days per week.
The BHF analysis found that the average British man spends the equivalent of 78 days a year sitting, which equates over the span of their life to around a fifth of their time. Women, on the other hand, spend around 74 days a year sitting.
It is believed that, in the UK, almost one in 10 premature deaths from coronary heart disease are caused, or at least contributed to, by inactivity. A lack of physical activity is also believed to contribute to around in six deaths in total.
The British Heart foundation are hoping that people will take up the BHF MyMarathon challenge, which involves running or walking the equivalent of a marathon across a whole month.
In the report, it was found that around 76 per cent of people referred for rehabilitation after suffering a heart attack or having heart surgery, could be described as inactive.
They warn that more than 5 million deaths worldwide can be attributed to physical inactivity, making it one of the top 10 leading causes of death.
Dr Mike Knapton, associate medical director at the British Heart Foundation, said: "Levels of physical inactivity and sedentary behaviour in the UK remain stubbornly high, and, combined, these two risk factors present a substantial threat to our cardiovascular health and risk of early death.
"Evidence shows keeping physically active can reduce the risk of heart and circulatory disease by as much as 35 per cent and risk of early death by as much as 30 per cent."
Regional variations were also found to be present in the analysis, with the North West of England having 47 per cent, or 2.7 million adults that are physically inactive.
The South East had the lowest rate with 34 per cent of its adults being classed as inactive.
Over 20 million physically inactive in the UK
Tue, 04 Apr 2017
Recommended linksExercise can reduce blood pressure
Children in the UK among the least active in the world
Mediterranean diet could save 20000 lives in the UK
Online adverts for junk food could soon be banned in UK
The Dukan Diet is Losing its Popularity
Poor Diet and Drinking Places UK Women at High Risk of Cancer
Can the Dukan Diet Be Harmful to Dieters
Kate Middleton Gives the Dukan Diet a Fresh Perspective
Jennifer Hudson Has Successfully Dieted to UK Size 8
Obesity Can Trigger Leukemia
Barbecue Meals Branded as Unhealthy for UK Diet
Katherine Jenkins is a fan of the Dukan diet
Millions of UK Women on Unsafe Diets
80 Per Cent of Children in the UK not Getting Enough Fruit and Veg
|No link found between dairy products and heart attack or stroke - Tue, 16 May 2017|
|Gluten free diet may increase risk of obesity - Fri, 12 May 2017|
|Breast cancer reducing weight loss scheme unveiled - Tue, 02 May 2017|