A top personal trainer shares 3 common mistakes people make when trying to build muscle

Business Insider•Sun, Aug 16, 2026, 09:30 AM•2 min read

Harley Pasternak has spent 30 years helping people build strength and muscle. He's seen the same mistakes along the way.

Source: [Business Insider](https://www.businessinsider.com/top-personal-trainer-shares-3-common-muscle-building-mistakes-2026-8)

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