The phrase "...up a storm" is often used to describe someone who is expressing themselves with great enthusiasm or intensity. There are a variety of synonyms that can be used to convey this same idea, including "going all out," "letting loose," "unleashing," "pouring it on," "spilling over," and "bursting with energy." Each of these phrases conveys a sense of explosive motion and energy, suggesting that someone is pouring all of their passion and intensity into whatever they are doing. Whether you're describing a musician who is playing their heart out on stage or simply someone who is dancing with abandon, these exciting phrases can help you capture the energy and excitement of the moment.