The Manitoba Cycling Association has created three excellent training videos that explain aspects of cycling in clear and sometime humorous language.
The first video is about helmets, the second about practising skills, the third about proper road riding.
The videos can be found at the bottom of the following page, under the heading “Safety Videos”.
Here is a great resource for bicycle safety divided into three groups: Ages 5-9, ages 10-14 and ages 15-18. Each section includes a video, a quiz and additional resources.