Pretty soon your gym gear will be more high tech than the groaning treadmill beneath you. Smart textiles and wearable devices can monitor your vital signs as you go about daily life. These clever clothes already exist and look set to find a market niche especially in elite sport and healthcare, say European researchers. And who stands to benefit most from these clever clothes? People with heart conditions or undergoing rehabilitation that require constant monitoring, athletes, newborns and people with sleep apnea are among the potential users.