What phrase best defines the term "rhythm"?

The term "rhythm" is best defined as a regular pattern of sound. In the context of group exercise, rhythm is often associated with music, which lays the foundation for the timing and pace of movements during workouts. Music creates beats that can be anticipated, and this predictability is crucial for both the instructor and participants to stay in sync with each other. The regularity of sound helps facilitate an engaging atmosphere and can enhance motivation and performance during exercise.

While a regular pattern of motion, an irregular beat, and a repeating cycle of movement are related concepts, they do not encapsulate the essence of rhythm as effectively as the concept of sound. Rhythm in group exercise primarily deals with how sound influences movement, making it the most appropriate choice for defining the term.