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The easiest way way to see it is watch the swing and if you dont have BAT LAG ( where your back elbow passes up your hands) you most likely can handle the weight.
I have seen it with the high school girls trying to use these monster bats we have.
their hips and elbow are trying so hard to pull the weight of the heavy bat thrue that they pass up the hands and the bat head never gets out front
Sometimes when we see this as to the elbow getting ahead of the hand we say stay strong on the back side so the elbow is directly over the hand.
I have taken a rope and knotted one end of it to serve as a knob of a bat and you stand behind the hitter and hold the other end of the bat....the hitter moves away from you so they take the slack out of the rope and provide a little tension.
Now very slowly have the hitter load and go to toe touch and start to close the gap or slot the elbow as they are simultaneously making a good first move with their lead arm elbow of about 2 to 4 inches forward or linear...the tension will increase and then see where their elbow and hand are. The lead arm elbow should be above the hands and the hands are above the plane of the pitch. If the elbow cleared the body it will be a strong move however if the elbow is close to the body they will not be in a strong position to put tension on the rope.
Next have them back up to a net so the net is in the position of the catcher then swing an actual bat...did the bat touch the net? If so look for the torque of the bat going forward then backwards to what we term bat drag verses lag. Then ask them to pull the bat or whip the bat from behind their head as described above and usually they will not touch the net and that is bat lag. The closer they can get to the net without hitting it is the better hitter in my opinion as to mechanics.