0
No, physically fit parents will not always sire physically fit children. This depends somewhat on your definition of "fitness" however fitness is generally taken to mean the level of endurance for physical tasks and is improved by training. If the parents do lots of exercise they will become more physically fit, but their children may or may not exercise and so may or may not be physically fit. Children brought up in a houshold where people generally exercise will be more likely to take part in exercise and therefore be physically fit. This is a case of nature verses nurture. The best way to think of it is that an adopted child brought up in an exercising houshold is likely to be fit however the child of fit parents brought up in a couch potatoe houshold is likely to be unfit. The fitness is causes by exercise not by genetics.
