Just 14 days as a couch potato can make you ill
Just two weeks of a couch potato lifestyle increases the risk of serious disease, research has suggested.
Experts found that 14 days of sitting around reduces muscle mass, increases body fat and raises the potential for high cholesterol.
Taking 10,000 steps a day - widely regarded as a target for maintaining good health - should be something people strive for, they said.
The team, from the University of Liverpool, followed a group of 28 healthy people of a normal weight with an average age of 25.
Participants usually took 10,000 steps per day or more but did not have more than two hours of structured exercise per week.
For 14 days, their exercise levels dropped from a daily average of 161 minutes to 36 minutes.
The results showed significant changes to the body, including loss of muscle mass and increases in total body fat.
There was also an increase in liver fat and an increase in bad cholesterol markers.