Our ancestors required an acute sense of self-preservation matched with a keen sense of observation. Always scanning, smelling, listening to the surroundings, on the watch for danger, aware of what immediate action needed to be taken, whether it was running from a saber-tooth tiger, dodging a falling rock, eluding a poisonous snake, or just avoiding a careless footfall. Remember that a twisted knee or a broken ankle could spell death to anyone who couldn’t run away from danger. In fact, it was probably trauma (or a brief careless lapse in judgment) that was most responsible for the low average life expectancy of our ancestors, despite their otherwise robust good health. Avoid trauma and there was a very good chance you could live to be 60 or 70 – and be extremely healthy and fit. Modern day hunter gatherers maintain strength and health often well into their 80s.
Eliminate self-destructive behaviors. These concepts are self evident to most people (wear seat belts, don’t smoke or do drugs, don’t dive into shallow water), but so many of us live our lives oblivious to impending danger. Develop a keen sense of awareness of your surroundings and heed the logic of potential consequences.