(7) The Answer

From the research it is found that the optimal principals of biomechanics in the butterfly stroke is very important as each phase has a special technique to execute. Through fluid drag and hydrodynamic propulsion drag and lift help a swimmers fluid motion throughout the water to improve their swimming time. Through simulations movements and rotations of the arms and hip flexors keep the body centered and able to move undulated and maiximise the swimmers optimum force to significantly improve their time and technique and also vital in skill development (Blazevich, 2012).

The catch phase starts the stroke off as the hands prepare and is used as a lever to propel the swimmers centre of mass forward, which has the swimmers largest inertia values forward through the water. The front sweep then follows the catch phase and this phase gets the arms to begin to propulsion into the water and this can be known as a pull like movement.

The next phase in the butterfly stroke is the back sweep, this phase produces the most drive through the water as it is fundamental when the athlete pushes back and propels forward quickly. The arms will begin to extend at the shoulder and will horizontally abduct. Finally, the last phase of the butterfly stroke is the recovery phase and it is fundamental as a quick transition back to the initial position and first phase of the butterfly stroke. The arms should be behind the body from the last phase of the stroke.