I liked doing a 3v1, 4v2 or pentagonal 5v2 (since I ran 3-2-3-2 this fit our "formation") with the progression to "if the outside make 5 passes the 6th one should release someone to goal/if the inside win the ball its 2v1 past the "base" of the pentagon" just playing to 2 puggs. We'd mix it up with 2v1 with the guy who gave up he ball having to make the recovery run, every nth pass could be a release to goal (so 4th,8th,12th)/defenders have to figure out the pattern, defenders win it's 2v3, etc.... I think there's a disconnect at the u10/12 vs full field with "rondos" and "recycling, resetting". You can probably run your kids ragged on a u10 field especially by having them in rondo mode full time, since teh space is so small. On a full field it seems you really only "rondo" to break into a zone/get to a shooting situation or relieve a numbers down situation. Circulating through the back line - even if they're at midfield - is different, maybe covered in shadow play?