Campaign Sprints show up randomly for players who are at least level 5. They task you with completing special timed challenges within the Campaign mode.
If you've progressed through most of the Campaign, you may not get a Campaign Sprint anymore. Likewise, if one has just ended, you may not see one for a little while.
If you've progressed through most of the Campaign, you may not get a Campaign Sprint anymore. Likewise, if one has just ended, you may not see one for a little while.