Motion analysis device for sports

A wrist worn device for determining information about the movement of a human body when swimming, the device comprising a waterproof housing containing:

• at least one accelerometer operable to generate both a first acceleration signal along an axis parallel to the proximo-distal axis of the user's arm in use and a second acceleration signal along an axis parallel to the dorsal-palmar axis of the user's arm in use;
• a processor operable to process the first acceleration signal and to thereby generate a first value of a swimming metric relating to movement of the human body and operable to process the second acceleration signal and to thereby generate a second value of said swimming metric, the processor further being operable to compare the first and second values of said swimming metric and to select the greater of the two as a selected value;
• a means for feedback of the selected value of said swimming metric to the user;
• and
• wherein said swimming metric comprises one swimming metric chosen from the group consisting of a lap count and a stroke count.