Question

define the term overload.
a. exercising for too long a period of time.
b. failing to reach your goals because you have too many to really focus on any one of them.
c. putting too much weight on a machine at the gym.
d. a greater than normal physical demand on muscles.

Explanation:

In the context of physical fitness (related to Medicine and Health sub - field of Natural Science), the overload principle is a key concept. It is about challenging the body (muscles in this case) more than what it is accustomed to. Option A is just about duration, not specifically the physical demand on muscles. Option B is about goal - setting and focus, not related to the physical aspect of overload. Option C is too narrow as it only refers to weight machines, while overload can be achieved in various ways (not just with gym machines). Option D correctly captures the essence of overload as a greater - than - normal physical demand on muscles.

Answer:

D. A greater than normal physical demand on muscles.