Try this
Have the person in seiza, but on the balls of their feet. Place one hand down near the knee for balance. The second hand goes between the knees and through untill the shoulder is on the mat. Make sure the head is tucked properly. At this point have them lift their knees off the mat without moving thier feet. That should cause them to do a proper front roll. Once they aquire the skill from this level then go to a higher level such as one knee down, and then eventually standing.
Let me know how this works.
Walt
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