I think butterfly requires more effort and breast stroke requires less

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Among the four strokes of swimming i think butterfly requires more effort. High pressure from hands are required. Back stroke does not require serious breathing exercise as legs do everything. Freestyle requires hands and legs working together. Breast stroke is most relaxing. https://www.youtube.com/shorts/mjKy9FR5MIM https://www.youtube.com/shorts/bJ1nP6bPuSU https://www.youtube.com/shorts/u4OgsyjVfCU https://www.youtube.com/watch?v=qcab0kvSaUY