In a manner involving acrobatic movements; with skillful balance, flexibility, and physical daring.
From acrobatical + -ly adverbial suffix. Follows standard English pattern of converting adjectives to adverbs describing how an action is performed.
This adverb captures the *way* something is done with daring and skill—gymnasts don't just move acrobatically, they do everything acrobatically, including how they walk or position themselves.
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