“Strike the
Silver” means hitting someone’s jaw, usually a
gangster or
hoodlum who have silver grills in their mouth. So “training to strike the silver” refers to someone who is working out to get stronger in preparation for a fight.
Gym
dude: What’re you working out for?
Other gym
dude: I’m training to strike the silver,
man.
Gym dude: Damn, alright, good luck!