Final answer:
The movement described is a swimming stroke, which involves using the hands and lower arms. Keeping the hands still while catching a ball makes it difficult to control the ball. Hitting water with the full palm creates resistance, while diving with fingers first reduces resistance.
Step-by-step explanation:
The movement of the hands and lower arms that helps keep the body on the surface of the water and moves the body through the water is called the swimming stroke.
When catching a ball while pulling the hands toward the body, the hands act as paddles, providing resistance to the movement of the ball. Keeping the hands still while catching a ball makes it difficult to control and stabilize the ball.
When hitting the water with the full palm, the large surface area creates a lot of resistance. Diving the hand with the fingers first, like a swimmer doing a dive, reduces resistance and allows the hand to move smoothly through the water.
It would be advisable for people to avoid orientations that increase resistance, such as hitting the water with the full palm, as it slows down their movement in the water.