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The official app of Proving Ground Studio in Hull, MA. Download the app to find and book training classes. From the app you can view class schedules, book group classes, purchase class packages. Proving Ground is a revolutionary training studio offering top-quality functional training classes and personal training sessions. We focus on training smart, with mobility and recovery as key ingredients of each workout. “Sometimes we are tested. Not to show our weaknesses, but to discover our strengths.” This is Proving Ground.