Kind of the opposite of Bronco's philosophy from a few year's back.

Those four-hour practices? Harbaugh turned those into a point of pride for the group. Players say, at first, there were guys on the roster who weren't thrilled with the idea of spending nearly every countable hour in spring on the field being pushed to the edge. They'd never gone through that before. Most teams don't do that.

But over time, Harbaugh began to single out players who never missed a minute. Harbaugh printed up T-shirts that read "I played 60 hours of Michigan football" for those who made it through all 15 four-hour practices. He also gave them perfect attendance certificates.

http://www.mlive.com/wolverines/index.ssf/2015/08/jim_harbaugh_wont_detail_michi.html

Bronco: "...our practices are very short and efficient and we really try to maximize the time we have with these kids because they have other things going."