Have you tried leg assisted pull-ups? This is a good alternative

How to do your first pull-up - Quora

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How Elite Athletes Perform Better Pull-Ups

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How to Do a Pull Up

CrossFit

The Only Guide You'll Need for Perfect Pull-Ups (with Game-Changer Ill – Gravgear

💥Pull Up Strength💥 Watch 👇for 5️⃣ great options to help you do your first pull up 🥳 Pull ups are no joke. They are a great test of strength & control

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Should I keep my legs straight when I do pull-ups? - Quora

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Get Your First Pull Up With These 5 Progressions

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Yes, The Chin-Up & Pull-Up Are Different. And Yes, It Matters.