lämmittelemällä
lämmittelemällä is a Finnish word that translates to "by warming up" or "through warming up." It is the adessive form of the present active participle of the verb lämmitellä, which means to warm up, to get warm, or to engage in light exercise for preparation. The adessive case in Finnish, indicated by the ending "-llä" or "-llä," often signifies the means or manner by which something is done, similar to the English prepositions "by" or "with."
Therefore, lämmittelemällä describes an action or state achieved as a result of the process of warming up.