Two accelerometers and a gyroscope record data including bat speed, time in the strike zone, and angles of impact in this tiny tracker that attaches to the handle. Best trick: After a session in the cage, we watched the path of our swing in 3-D. [$150; zepp.com]
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Action-Packed Summer Trips
Race Dune Buggies, Explore Italy, Bike Yellowstone
Plus: Fighting Poachers and Oil Companies in Congo
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