A wearable device has user movement sensors and core contraction sensors. Signals from the sensors are transmitted to a processor which analyzes the movement signals and determines when a qualifying movement is performed which benefits from core contraction. Signals from the core contraction sensors are also transmitted to the processor and are used to determine if the core is contracted during the qualifying movement. If the core is contracted during the qualifying movement, the movement is a protected qualifying movement. However, if the core is not contracted during the qualifying movement the movement is an unprotected qualifying movement. The system can inform the user when unprotected qualifying movements are performed.
