No goals, no shots, just close-quarter possession.
The Bhoys travel to St Mirren five points clear of second-placed Aberdeen with a game in hand and will no doubt hope for plain sailing from now on in the league, with a Scottish Cup semi-final and possible final to also contend.
To make things flow as well as possible, though, it's been typically hard-working in nature from the Celtic players in training - no doubt much to boss Ronny Deila's liking.
And, as can be seen in the second half of the video above, a prominent feature in training was a possession-based drill which involved players simply trying to keep the ball within a confined area.
Two teams fought for possession and there were no shots, goals or penalty boxes.
It's far from a brand new, revolutionary training regime but, judging by the close control some of Celtic's stars were able to display, it's certainly doing the first team some good.
As a first domestic treble since 2001 potentially nears, could these kinds of training drills be the difference between crossing the line and falling just short of it?