In an extremely interesting conference talk in April 2010, Elder David A. Bednar, of the Quorum of the Twelve, told us that bearing testimony was a good way to gauge the spiritual well-being of our children. We decided long ago that if we had to pick only one thing that we could do with our children to increase their spirituality, it would be have them bear their testimonies on Fast Sunday. Someone gave us this idea years ago and it was reinforced by Elder Bednar's talk.
We realized as our children were growing up that some were too shy to bear their testimony in testimony meeting and others were almost too boisterous about it.