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How does google separate keywords from phrases

How does google pick out the keyword that I want to rank for, out of a phrase?
Example: I want to rank for “bodyweight exercises”. I added some bonus keywords (best, to do, home, weight loss) in the title to better describe the article I am writing about. So I created a title: Best Bodyweight Exercises To Do at Home (for Weight Loss).
How will google pick “bodyweight exercises” out of that phrase. Why doesn’t google pick “weight loss” or “home” as the main keyword?

Does anyone know the answer ?

I don’t think they disclose that information. Their algorithm is a riddle, wrapped in a mystery, inside an enigma on purpose to keep people from getting one over on them by utilizing information like that to their advantage.