For women who work out regularly, both preacher curls and inclined curls build arm muscle just about the same way — no matter where you look along the upper arm.

For women who work out regularly, doing preacher curls that stretch the biceps a lot might help build more muscle in the lower part of the upper arm—about an 8.8% increase—compared to other curl types.

For women who work out regularly, doing preacher curls or incline bicep curls doesn't seem to change where their biceps grow — both exercises lead to similar growth patterns after 9 weeks.

If young women do bicep curls on an incline bench, they’ll likely grow the upper part of their biceps more, but if they use a preacher curl bench, they’ll grow the lower part more — the way you curl matters for where your muscle grows.

Doing a specific type of bicep curl on an incline with changing resistance doesn't seem to make certain parts of the upper arm muscles grow more in women who work out regularly — even after doing it consistently for 9 weeks.

Doing inclined bicep curls 3 times a week for 9 weeks doesn’t seem to make women’s biceps grow more in specific areas, even when they push themselves to the max each time.