Defining a goal that can be achieved through many ways

Solution 1:

How about a multifaceted approach: having many facets or aspects as a way or means of reaching something:

• Cancer Immunotherapy Takes a Multi-Faceted Approach to Kick the Immune System into Gear.
• The Importance of a Multifaceted Approach in the Assessment and Treatment of Childhood Feeding Disorders

Solution 2:

There is more than one way to skin a cat and there is more than one way to lose fat.

And then I would also offer All roads lead to Rome which could probably stand by itself in your writing or you could pun it up with All roads lead to Health.

There are many different routes to the same goal.