When someone is described as "limbered up," it generally means that they have stretched and warmed up their muscles in preparation for physical activity. There are many other words that can be used as synonyms for this term, such as loosened up, warmed up, stretched out, prepared, primed, readied, and mobilized. Each of these terms conveys a slightly different nuance, so the choice of which to use depends on the context in which it's used. For example, "loosened up" may imply a more casual or relaxed approach to physical activity, while "readied" may suggest a more intense or focused preparation. Regardless of which term is used, the implication remains the same: the individual is ready for action.