@higs - I totally agree with you regarding your suggestion of how to cope with brain freeze. I also practice my 'brain exercises' on Lumosity.com free brain training exercises. It's free and can be accessed by simply using an email, no other requirements. It's fun, simply exercises that you can do repeatedly throughout the day. The games change everyday offering three new ones each day. Fun! Fun! Fun!
There's no complex math problems, or rubic's cube tasks involved. Great for all ages!