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Phase (degrees) of the two-beat travelling wave and the four-beat travelling wave of a typical national level butterfly swimmer for the oscillations of the hip, knee, and ankle ([13] Sanders, 2007).
| Two Beat Wave (Degrees) | Four Beat Wave (Degrees) | |
|---|---|---|
| Hip | 201 | 89 |
| Knee | 266 | 136 |
| Ankle | 323 | 204 |
