A system is disclosed comprising a device to be worn on a limb of a user, having a motion sensor, a feedback sub-system and software configured to analyse data from the sensor and provide continuous, real-time alert generation via the feedback sub-system. The software may be configured to compare the value of acceleration/deceleration to a predetermined value and further, upon exceeding that value, trigger the feedback sub-system to deliver feedback, the intensity of which may be based on how different the actual value is to the predetermined value. The motion sensor may be an accelerometer. The sensor may be part of a mobile device i.e. smart-watch 5, smart-wristband 3 (ankleband 3) or smartring 4. The feedback may be in the form of light, audio or haptic. The present invention aims to help with improving technique relating to slow exercise (i.e. yoga or tai chi) which in turn helps with alleviating any or all of aches, tension, and tremor issues.
