I recently purchased the book "Hard Crochet" by Mark Dittrick. The book was published in 1978, and documents a crochet technique using extremely tight tension and a small hook to create a very firm fabric. One of the projects in Mr. Dittrick's book is a Stetson-Styled hat. You can see the results here on my granddaughter. I'm keeping this hat for myself.
The repetitive actions needed for knitting and crochet can bring the mind and body to a state called a "relaxation response" that is quite similar to what people experience with techniques such as repetitive prayer, yoga, meditation, Tai Chi, and other relaxation disciplines. Research at the Harvard Medical School Mind/Body Institute has found that when an individual is crocheting (or knitting) his/her heart rate can drop 11 beats a minute and his/her blood pressure drops as well. These results can have significant health benefits for people who knit and crochet. Therefore, I am a man who crochets. I design my own crochet and sell patterns and finished projects.