Pathfinder emphasizes muscles for grappling, but I’ve known small people with solid technique who can hold even the biggest guys.

Mastery over Muscle Feat 7

General Skill
Prerequisites expert in Acrobatics

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You don’t need to be strong if your technique is solid. You can use acrobatics instead of athletics when using weapons with the grapple traits or when you use the grapple action.

Thoughts?