Work Out Core Muscles with Unstable Surfaces or the Oov®

Check out this article and this Web site.

https://journals.humankinetics.com/view/journals/jsr/28/8/article-p803.xml

http://www.oov.com.au/

You can buy my new book Musings below:

https://www.lulu.com/shop/search.ep?keyWords=musings+patsis&type=

My other short story and poetry book Life, Work and Play, fitness book Pocket Guide to Fitness (two versions and anti-bullying children's book The Boy in a Wheelchair are available on Authorhouse.com or Amazon:

https://www.authorhouse.com/en/search?query=louiza+patsis

https://www.amazon.com/louiza-patsis/s?k=louiza+patsis