Can You Get Too Much Exercise? By GRETCHEN REYNOLDS

http://well.blogs.nytimes.com/2013/07/24/can-you-get-too-much-exercise/?_r=1

High Frequency Training: Calisthenics for Survival

Danger is everywhere; even the most friendly and safe places can create circumstances that will threaten your life. The danger is rarely obvious, but the potential for it is always there waiting, never resting, and neither should you. The best way to fight the danger is to be prepared for it. But how could you be constantly ready to deal with unseen and rapidly occurring dangers? Through high-frequency training.






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http://mymadmethods.com/articles/conditioning-articles/1219-fitness-tests-thatr-will-challenge-your-will-to-survive