Pitchers always look like they should lose some weight.....they have a tendancy to be thick from the waist down....helps them drive off the mound....alot of your best pitchers historically have looked overweight. You can be a completely fit person and since no one excercise works every muscle whenever you do something that you do not do regularly you run the risk of tweaking or inflaming that unworked muscle.....swinging a bat uses different muscles than pitching....running....or lifting weights.....an NL pitcher who didnt take regular turns in the cage from Spring training on would just as likely injure himself batting.
Posted by tomnev