markflour,
1. Working w/ your ABC Lists. I have almost 50 now, but she did say the first 300 repetitions of a new behavior are the hardest. I'm curious to see what happens by 300 that makes it a magic number. But this is mental hygiene.
2. All of her games are mental hygiene as well b/c you are exercising your mind/memory.
3. Anything that you do that is brain friendly is also mental hygiene. One of the most important mental hygiene practices i developed from the PhRing course is drinking a glass of water prior to any mental work.
4. Read the second paragraph under step 5: Re-construct on pg. 54 of your manual. This is the most important mental hygiene technique i gleened from her course.
Hope this helps!