Abstract: A computer-based method is provided for evaluating risk for workers. The method includes receiving, at a processor, a first signal from a first wearable device. The first signal is received from a first wearable device and is indicative of vertical acceleration detected by the first wearable device over time. The method then identifies, in the first signal, an indication of weightlessness at the first wearable device. Upon detecting the indication of weightlessness, the method proceeds to determine an amount of time associated with the indication of weightlessness and then determines a risk metric associated with the indication of weightlessness based on the amount of time associated with the indication of weightlessness.