Considerations' in your example means 'facts or subjects that need to be thought of (considered) when judging something or making a decision'.
When choosing a car, important considerations might be the price and running costs, the size of your garage, the transport needs of you and your family, and your opinion of the brand and model.
When deciding which job to take, considerations may include the salary, the location, promotion prospects, commuting costs, and how satisfying the work would be.
The writer is saying that, apart from thinking about exercise in connection with performance for sports, it should be thought of as necessary to make our bodies perform as they should generally.
consideration noun (SUBJECT/FACT) B2 [ C or U ] a particular subject
or fact that needs to be thought about when judging something:
Comfort/Safety is an important consideration.
Consideration (Cambridge Dictionary)