The impact that exercise has on health and death is well known. This paper looks at changes in exercise. It asks what happens to people's risk of death when they change their fitness levels.
Message Changing fitness levels in middle age can affect the risk of dying.
Just small increases are beneficial, particularly among the unfit. Reference G Erikssen et al. Changes in physical fitness and changes in mortality. Study Participants were 1,428 Norwegian men. They were also given a clinical examination on both occasions.