Practice Quiz

Group Fitness Instructor

Category - Exercise Selection

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Classes held in a pool can offer a challenging exercise environment, due in part to the inherent properties of water. Which of the following is MOST correct? The drag effect of water
  1. Allows the instructor to increase resistance merely by performing movements more rapidly
  2. Creates a slowing of the heart rate during exercise in water by increasing the shift of blood to thorax, increasing pre-load of the heart, and thus increasing stroke volume
  3. Causes patients with a habitual visual method of joint placement (e.g. someone who looks at his feet to walk) to use his proprioceptive system instead.
  4. Produces less spinal and lower extremity joint compression than the identical exercise performed on land.
Explanation
Answer: A - Water’s viscosity makes the pool an ideal environment for instructors looking for quick changes in resistance. There is no need to swap our equipment or change position; rather, instructors who wish to increase the difficulty of any exercise in water only need alter the velocity of movement. By doubling the velocity of movement, instructors can nearly quadruple the resistance experienced in a given exercise.
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