I have to admit to some confusion over the verb forms of affect and effect. The free dictionary has this helpful note:

Affect and effect have no senses in common. As a verb affect is most commonly used in the sense of “to influence” (how smoking affects health). Effect means “to bring about or execute”: layoffs designed to effect savings. Thus the sentence These measures may affect savings could imply that the measures may reduce savings that have already been realized, whereas These measures may effect savings implies that the measures will cause new savings to come about.

So an agilist should effect positive change not affect it and affect impediments not effect them.