I can only really think of specific examples to specific cases, but things that take minimal effort, yet still give fairly high returns when compared to other low-effort strategies.

If the task is "eat vegetables" and the restrictions are money, proximity to store, spoils too quickly, and no freezer, then an example of something that is NOT a FOO strategy would be to sell your property, move to or purchase a farm, start growing your own vegetables and eat those ones, while selling the excess to buy a better freezer.

Clearly, I'm using hyperbole here, but you get the picture. You can't deny that that that IS a valid method to gain access to vegetables. But it's not first-order optimal. First order optimal would be to buy incrementally as you need the vegetables, when doing other activities in the same day that brings you close to the store.

A Non-FOO strategy for "excercise more" would be to drop work and all other activities and begin a olympic-level training regimen. A FOO strategy would be to incorporate excerse into regular daily activities (stairs, biking instead of driving, etc.)