This has come up a bit in our group: Can a force user "passively" use Enhance to boost Resilience to withstand hazards she is unaware of, such as poison, radiation and disease she isn't aware that she's exposed to?
The wording suggests the use of the power is an active choice:
QuoteWhen making an Athletics check, the user may roll an Enhance power check as part of the pool.
Force users may choose to use the power to improve their natural abilities,
Force users can employ the power to achieve physical feats not otherwise achievable by other beings,
Emphasis in italics mine.
This language suggests that using Enhance is an active choice, like "I want to run really fast", which kind of runs into a brick wall with resilience. Sure, I guess if you notice that you've been poisoned or whatever, I guess you can focus your power on neutralizing the poison, but before that? I guess poison, radiation and disease can do a lot of damage before you notice any symptoms, but that also brings up the question when you roll that resilience check? When first exposed? When the first symptoms kick in?
Or is the Resilience use of Enhance some sort of "always on" (unless force dice are committed or otherwise unavailable), meaning that Jedi and their ilk tend be highly resistant, if not immune, to diseases poisons etc?