SANTA CLARA - One of the story lines during the offseason was how defenses - like that of the 49ers' Week 1 opponent, Green Bay - will adjust to the proliferation of read-option quarterbacks like Colin Kaepernick.San Francisco quarterback Colin Kaepernick,above, airs one out on the first day of workouts. Kaepernick was targeted for hits by the Ravens in the Super Bowl - even when he didn't have the ball. At left, linebacker Aldon Smith appears to be in a good mood as he stretches out. Marcio Jose Sanchez Associated Press