Posted by: Jack Mankin (MrBatspeed@aol.com) on Thu Nov 19 19:08:49 2009

Hi Mark & Chuck

THT is the term I use for the mechanics that accelerates the bat-head rearward from the 'launch position' to the 'lag position.' I have shown many video clips of the best hitters applying THT and plotted the bat's rearward trajectory. Before we discuss how the mechanic is best applied, I think you would have a better understanding of the mechanic's importance if I showed swings where little THT is exhibited.

I will work on some comparison clips this weekend and hopefully Brian can have them ready (internet address) early next week. In these clips I will point out mechanics that generated good rearward acceleration and those that do not. -- Although I agree with you that BHT can generate good bat speed by itself, all the college hitters I studied who produced 700+ slugging percentages, exhibited strong THT mechanics.

Jack Mankin