Zone 1: between the knees establish power base
Zone 2: Distance between elbows as the bat moves into launching area
Zone 3: Distance of bat head from point of back shoulder
then he goes on to talk about the Front Muscle System:
Muscle 1: muscles inside and above kneecap
Muscle 2: lower abdominal area
Muscle 3: pectorial muscles of the chest
I have never heard about the zones and was wondering if anyone had any thoughts about it? It was an interesting read.