I've got 5 types of coffee in the house right now (one Colombian, one Peruvian, one New Guinean, one Ethiopian, one unknown blend).

All coffee shares the same fundamental taste, but the variations in strength, of the aftertaste, of the aroma, of the color, etc ... all make each batch of coffee slightly different from the last.

On top of that, each coffee tastes different once you add another compound to it -- a coffee with cream is distinct from a coffee with butter, is distinct from a coffee with coconut milk.

The reason for bringing this up is that we tend to derive a lot of happiness from small deviations from what we expect. This then becomes a starting point for effortless sustainability.

It is particular useful when we're trying to make a habit change. We all know that changing habits is difficult if approached with the mentality of deprivation -- "I no longer get to do X". Rather, the most efficient approach is to introduce a new habit -- "I'm the guy who gets up in the morning to run, bike, or swim".

Applying the same principle of having multiple variations which are proximal in your mental heuristics tree is potentially a strategy that can pay off -- variations bring with them proximal rules of thumb that make it easy to derive a novel stimulus to the brain, that wires it up to expect success and excitement.

eg: slightly different workouts to challenge the body without losing the intended primary stimulus.

ie: when in doubt, more shades of the same.