In some cases, people have died while exercising. Most of these deaths are caused by overexertion in people who already had heart conditions. Many of these deaths have been preceded by warning signs such as chest pain, lightheartedness, fainting and extreme breathlessness. These are symptoms that should not be ignored and should be brought to the attention of a doctor immediately. Some of the deaths that occur during exercise are not caused by the physical effort itself.
Death can occur at any time and during any kind of activity - eating, sleeping, sifting.
This does not necessarily mean that a particular activity caused the death - only that the two events happened at the same time. No research studies have shown that physically active people are more likely to have sudden, fatal heart attacks than inactive people. In fact, a number of studies have shown a reduced risk of sudden death for people who are physically active. It is very important for these people to follow a gradual and sound exercise program. If you consider the time your body may have been out of shape, it is only natural that it will take time to get it back into good condition.