San Francisco 49ers coach Jim Harbaugh isn't opposed to the Hard Knocks program.

The NFL says it can make a team go on the show if no one volunteers, but a team can refuse if it's made the playoffs during the previous two seasons.

A team doesn't have to go on if it's been on Hard Knocks in the previous 10 years.

Arizona Cardinals coach Bruce Arians is opposed to the show altogether, but Harbaugh has a different attitude.

“There’s going to be teams that are going to be on 'Hard Knocks' and that seems like a popular thing and something people want to see,” Harbaugh said. “So, I don’t see it going away. You could stamp your feet and say I don’t want to do it, but I don’t know how productive that is for anybody concerned. I find it quite entertaining."

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Aaron Wilson covers the Ravens for The Baltimore Sun.