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

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

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

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