My Ds turned two in NOvember. From what I see and understand he doesn't sit still during nursery circle time. He goes three times a week. He either sits apart on or the edge and starts to roam around or do his own thing. They say he has got a bit better but this morning when I dropped him off (a bit later so story reading had started) he sat at a table while the story was being read.
When is this a problem? He's got a poor attention span and on the go a lot; likes to play with people. But he's also a great sleeper and loves one to one quiet time.