Failure to exercise is as bad for health as smoking a packet of cigarettes every day, experts have warned.

The World Heart Federation said physical inactivity doubles the chances of developing heart disease and increases the risk of diabetes and high blood pressure.

Doctors estimate that between 65% and 85% of the world's population fail to take enough exercise.

Professor Mario Maranhao, president of the World Heart Federation, said that children were also at risk.

Two out of three children around the globe take too little exercise to improve their health.

Health benefits

Professor Maranhao urged people to exercise.

"Even moderate exercise such as a brisk walk for 30 minutes most days helps control weight, cuts stress, anxiety and depression."

Professor Maranhao also advised people to improve their diet and to eat plenty of fruit, grains and vegetables and reduce their intake of alcohol and saturated fats.