FFS -
On the surface, it looks like Giambi pronates then supinates then pronates then supinates the lead arm:
http://efastball.com/images/baseball/hitting-swing-plane-giambi.gif
What do you think is going on under the hood ?
On the surface, it looks like Giambi pronates then supinates then pronates then supinates the lead arm:
http://efastball.com/images/baseball/hitting-swing-plane-giambi.gif
What do you think is going on under the hood ?