What principle of fitness means that if you stop exercising your fitness level will decrease? A.
Reversibility
B.
Overload
C.
Specificity
D.
Individuality

A. Reversibility

Explanation:

Because if you don't progress then you do the opposite, you reverse.

Sorry if my explanation is confusing it made sense in my head i just didn't know how to put it.

hope this help. ;)

carla slowed down in the beginning of her trip, stopped, and then sped up

in simple terms, the principle states that the buoyancy force on an object is equal to the weight of the fluid displaced by the object, or the density of the fluid multiplied by the submerged volume times the gravitational acceleration, g. this is also known as upthrust.