Strong Willed:

Strong Willed is of the positive traits.
It has a value of +4

The description is as follows:

Strong Willed:
You know what you want to do, even when the flesh is weak, your spirit is strong enough to compensate.
All tests that check if you handle some kind of strong strain (for example tests on athletics, acrobatics or body control) may be repeated because you've got a grip on yourself.