Many adults are increasing the risk of injury and osteoarthritis by not exercising or not doing so safely, a survey suggests.
One-in-five people said they always warm up and cool down when doing exercise.
Not doing so increases the possibility of joint problems in later life.
Reasons given for not warming up included "can't be bothered" (28pc) and "it's not important" (27pc). Nearly three-quarters (74pc) of people who never warm up said they had never been shown how to.
Only 17pc of people who warm up "rehearse" the movements associated with the activity, the survey by Arthritis Research UK and the Chartered Society of Physiotherapy (CSP) shows.
Dr Helena Johnson, Chartered Society of Physiotherapy chairwoman, said: "These survey findings are of great concern.
"Far too few of us are doing enough exercise, and many people who are physically active are not exercising safely.
"Failing to warm up first and cool down afterwards may increase the chances of suffering an injury, which could potentially lead to problems like osteoarthritis in later life.
The Active Age 2012 survey quizzed 2,583 adults and 1,022 children across the UK, asking about their physical activity levels over the previous week.
Just 5pc of adults are doing the recommended amount of two and a half hours of exercise a week.
Arthritis Research UK medical director Professor Alan Silman said: "Our survey found that most people exercise to improve their heart health, but it's also vital for strengthening muscles and keeping your joints healthy and firstname.lastname@example.org