Very little is known about prehistoric hominid cave dwellers  However, a recent study of skeletons of these hominids has revealed an important clue about their daily activities: skeletal fractures present are most like the type and distribution of fractures sustained by rodeo riders
Ttherefore, it is likely that these cave dwellers engaged in activities similar to rodeo riders -- chasing and tackling animals
If there is a similarity between two effects, then there is probably a similarity between their causes.