I saw an interesting little fact while surfing the internet today. It had to do with exercise and hypoalgesia (decreased sensitivity to pain). For some time there has been debate as to whether exercise increases an individual's tolerance for pain, but apparently a study was performed at the University of Wisconsin which proved that there is indeed a relationship between the two. Furthermore, "Results indicate that hypoalgesia occurred consistently following high-intensity exercise. In the studies in which exercise intensity was increased by increasing workloads, hypoalgesia was found most consistently with a workload of 200 W and above."
So if you keep up the intensity in Crossfit, you will build a body that is tougher and more pain-free!
The link to the article's abstract can be found here: http://www.ncbi.nlm.nih.gov/pubmed/12076175
Yours in health,