The phrase "jumping up and down" can be replaced by several synonyms to add variety to your writing. One such synonym is "bouncing," which suggests a lively and energetic movement. Another option is "leaping," which implies a more graceful and fluid motion. "Hopping" can also be used, which conveys a quick and repeated movement. "Vaulting," "springing," and "bounding" are other synonyms that capture the idea of jumping up and down. Using different synonyms for "jumping up and down" can help avoid repetition in your writing and make your descriptions more vivid and engaging.