By Matt Audilet On Saturday, Wolverines head coach Jim Harbaugh conducted a 15-minute workout with Colin Kaepernick during halftime of Michigan’s spring game in Ann Arbor. After showing off his arm talent in The Big House, Kaepernick shared a message to any NFL team with an eye on his attempted comeback. “More than anything, compete. How do I make sure I’m getting a little bit better each day. As an athlete, that’s something that is ingrained in you. Let’s push and let’s see how far we can push,” the former Niners QB said, per Ric Serritella. “Feels great to be out here,” he added. Kaepernick …