The Rock and Aaron Donald swear by this arm workout—here’s how to do it

When it comes to building arm muscles, Dwayne ‘The Rock’ Johnson and NFL player Aaron Donald are two people who know a thing or two about how to do it. So what step do they challenge each other when training the arms in the gym?

Fortunately for us, Instagram answers that question, as The Rock and Donald had a gym session together when the actor went to visit the L.A. Rams training facility before the new football season. The two can be seen working together, and one of the movements they focused on works the biceps and back muscles.

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