An apparatus for monitoring performance comprises two elements: a first element (4) for attaching to a human or animal, containing two or more of physiological, biochemical, kinematic, and/or environmental sensors and a processing means which records in memory signals or derivates of signals from said sensors and contains a means of re-transmitting this data to a second element, and a second element (13, 16) containing a display (12, 17) or audio output to present the processed live or previous recorded data to the user.
