Personal trainer Jack Claxton has a mantra he repeats before every workout: “A long muscle is a strong muscle.”

It’s a reminder—both to himself and his clients at David Lloyd Clubs—to always mobilize before making a beeline for the weights rack.

Over the years, he’s refined a short but effective routine that he now uses before every home or gym session. “This mobility flow helps keep muscles flexible, which allows for a better range of motion,” he says. You may like

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