Now in its third season the project, which comes with £2million of funding from Aviva, has introduced tens of thousands of Year 3 pupils to the game through tag rugby.
And students at Lings Primary showed their passion for the game and the Saints with the session watched by the whole school.
"The Saints are so much a part of our community and for our children to work with them today on the Aviva Schools Programme is brilliant," head teacher Leigh Wolmarans said.
"We've got 15 kids running around on the pitch, but it's everyone from Reception to Year 6 cheering on the banks. It's not just the playing side of rugby this develops, but the whole ethos of the school and its relationship with sport.
"Funding is key for any school and to have someone like Aviva facilitating this through the Saints is our lifeblood. The coaching is exceptional all throughout the year and the Saints are a unique club in the way they interact with schools. I can't thank Aviva and the Saints enough for a day like today."
Saints forward Clark reciprocated the enthusiasm and emphasised the importance of the links between rugby clubs and local schools.
"I've been impressed with what I've seen today, not just on the pitch but on the sidelines, too," he said. "Getting involved with these kids is important because they are potentially the players of the future and there were some really talented players out there today.
"It's nice that rugby is becoming a big part of what schools do and I'd have really enjoyed something like the Aviva Schools Programme growing up."
The Saints will have reached over 50 schools with the Aviva Premiership Rugby Schools Programme by the conclusion of 2012/13 and a selection of youngsters will also have the chance to represent the club in a tag demonstration at the Aviva Premiership final in May.
For more information on the Aviva Premiership rugby Schools Programme, click here.
