What are sets in relation to a fitness program?

Sets and reps are the terms used to describe the number of times you perform an exercise.

Explanation:

Completing several reps of a specific exercise in a row is called a set. A set is a collection of reps. When you see a workout plan that says to do 5 sets of 5 reps that means you’ll be performing the 5 reps as mentioned above, rest for a set amount of time (between 30 seconds to 2 minutes), perform those 5 reps again, rest, etc. for a total of 5 times or sets.