Select the Key Term That Is Most Associated with the Description

Select the key term that is most associated with the description below. Each term is used only once.
a. Any external influence that may enhance training, recovery, or performance
b. An inactive substance
c. Estimates the amount of certain nutrients needed each day
d. Low blood sodium level
e. An exercise stimulus that is of sufficient magnitude to cause enough stress to warrant long-term changes by the body
f. A degreed health and fitness professional qualified to assess, design, and implement individual and group exercise and fitness programs for apparently healthy individuals and individuals with medically controlled diseases
g. Nutrient needed in relatively large amounts
h. Storage form of glucose in the liver and muscle
i. A substance in solution that conducts an electrical current
j. A training principle that stresses muscles in a manner similar to which they are to perform
k. A wasting or decrease in organ or tissue size
l. A specialized type of athletic training that involves powerful, explosive movements
m. The absolute or relative difficulty of physical activity or exercise
n. The study of health-related events in a population
o. A food containing a relatively high amount of nutrients compared to its caloric content
-Placebo