The phrase "in form" is commonly used to describe someone or something that is currently in good shape or condition. There are several synonyms for this phrase, such as "fit," "healthy," "robust," and "vigorous." Other options include "top-notch," "excellent," "outstanding," and "superb." Additionally, you could use words like "prime," "peak," or "optimal" to convey the same meaning. It's important to choose the right synonym depending on the context of your sentence and the tone you want to convey. Whether you're describing an athlete's physical fitness or a business's current success, having a variety of synonyms for "in form" can help you express your thoughts more effectively.