Last month I wrote a newsletter on how hitting aids in baseball players in this 2011 study:



and hitting aids in softball players in this 2012 study:




DO NOT improve bat speed and are a waste money.


Now a new study in baseball players:



tested a hitting aid called a Decrease Moment of Inertia (DMOI) Bat:


used like this:



produced a 6% increase in BOTH bat speed and hitting distance after using the DMOI bat compared to no change to those training with normal bats:



The researchers made 2 important conclusions (highlighted below):



Hope this helps. Best of luck.