In another implementation, a signaling apparatus includes a glove that is configured to be worn on a hand of a user; a first light source that extends along and is affixed to at least a portion of a lateral side of the glove, the lateral side of the glove corresponding to a lateral side of the user's hand that includes, at least, the user's fifth digit, fifth metacarpal, and ulna bone; and a second light source that extends along and is affixed to at least a portion of a medial side of the glove, the medial side of the glove corresponding to a medial side of the user's hand that includes, at least, the user's radial bone and one or more of: (i) the user's first metacarpal and first digit, and (ii) the user's second metacarpal and second digit.