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I am no expert, but I would think, in terms of relevant physical training, you'd do best to replicate the motions you wish to strengthen with heavier weights. So, if you want a rock steady handgun stance, grip a dumbell with one or both hands like it's a pistol grip and raise it to a firing stance. For a long gun, use a bar with a weight on one end (the "barrel" end). For a strong base, squats and/or lunges. For a death grip, work out your hands. Do several sets of reps to exhaustion.
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