Harley Pasternak has spent 30 years helping people build strength and muscle.
In that time, the 51-year-old Los Angeles-based personal trainer, who has worked with Kim Kardashian, Rihanna, and Robert Pattinson, has seen people making the same mistakes, which keep them from making the gains they want to see.
Progressive overload, which means challenging your muscles more and more over time, whether through heavier weights or more reps, is crucial to building muscle, but there’s more to it than just that, Pasternak told Business Insider.
Rest and a thoughtful workout plan are also important if you want to build muscle, he said. For Pasternak…
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