"The instructo swing 1) takes up floor space; 2) gives Griffey Jr. endorsement $; 3) dents expensive bats if you're not careful; 4) makes the instructor seem indispensible since no one can really swing through the thing WITHOUT HELP FROM A TRAINED PROFESSIONAL; 5) holds up to 10 coats and jackets at one time during a practice; 6) when laid on its side, can serve as a medicine ball rack; 7) is a great warmup for chopping down trees; 8)comes in the color of your choice, as long as it is black; 9) removes top hand torque; and 10) can be used left handed or right handed with equal results!"
Should stay away from the game and stay away from coaching anything that doesn't involve a raquet.