Robert Griffin III

Chargers to work out Robert Griffin III

Chargers to work out Robert Griffin III

Since Philip Rivers became the Chargers’ starting quarterback, whoever has served as his backup has had one of the NFL’s most predictable jobs.

You stand, on the sideline, probably in an officially licensed ball cap, maybe signaling in plays, maybe holding the ball on extra points and field goals. But throwing passes? You probably won’t be doing much of that.

Rivers hasn’t missed a start in over a decade — a rare example of durability in a league where muscles tear, bones break and ligaments stretch.

Still, having a “Plan B” is still required, and Tuesday, the Chargers might be tinkering with theirs.

According to a league source, former Heisman Trophy winner Robert...

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