Which swimming stroke requires students to swim four strokes of butterfly and then freestyle for the Yellow Stroke School Swim Benchmark?

The swimming stroke that requires students to swim four strokes of butterfly followed by freestyle for the Yellow Stroke School Swim Benchmark is indeed butterfly. This benchmark is designed to assess students' proficiency in the butterfly stroke, which is characterized by its unique arm movement and dolphin kick. In this stroke, swimmers must coordinate the simultaneous movement of both arms moving in a circular motion along with a powerful and rhythmic kick that propels them through the water.

By requiring the students to perform four strokes of butterfly, the benchmark emphasizes not only their ability to execute the stroke correctly but also tests their endurance and ability to transition smoothly into the freestyle. The subsequent shift to freestyle allows the instructors to observe the swimmers' versatility and adaptability in the water, as well as their competency in switching between different stroke techniques.

In this context, both the technical mastery of the butterfly and the transitional skill to freestyle are vital components of the benchmark, highlighting why butterfly is the correct choice.