Often described as a 'Polypill' against a variety of illnesses and diseases, is exercise really the elixir for health? Can exercise prematurely wear out your joints? Does excessive training increase the risk of coughs and colds? Does prolonged exercise impair your hearts function? Can exercise lead to addictive behaviour? Its suggested that, in a lifetime, we have a fixed number of heartbeats; does increasing our heart rate through exercise shorten our lifespan? Participate in a discussion with life scientist Derek Ball about whether exercise is as good for you as we are led to believe.