I think this is great for any child, not just kids with DS. An excellent reminder for the toilet wall to help with feeling successful sooner. Toilet Training Children with Down Syndrome. This is an article on the National Down Syndrome Society's website.
Great article on best weight training exercises for chest mass. Some of the moves here are also great for triceps muscle gain. Barbell and dumbbell exercises included - and for beginner, intermediate and advanced weightlifters.