Rotation crunch, alternated - FB
| Equipo requerido | Pelota de ejercicio |
| Músculos primarios | Oblicuos |
| Músculos secundarios | Abdominales - Abdominales rectos, Todos los abdominales |
Instrucciones
| Place your lower back on the ball |
| Tighten the abdominal muscles |
| Move your torso obliquely forward |
| Move your torso back |
| Move your torso obliquely forward |