We all know that 30 minutes per day of strenuous exercise will provide many health benefits. Recent Federal guidelines from the Department of Health and Human Services1 have even made this official. The real question for most of us is how to find the time to exercise regularly and consistently. All we have is 24 hours each day to get done all the things we need to get done. Exercising often takes a back seat to work, shopping, cooking, cleaning, getting the kids ready for school and ready for bed, and all the other million-and-one little details that demand our attention every day.
Marathon running is a sport that began in 1896 at the first modern Olympics held in Athens, Greece. Today, marathon road racing is big business. The Boston Marathon attracts about 20,000 participants. The New York City Marathon is twice as large, with more than 40,000 runners. Successful marathoners train for 4-6 months to be able to complete the 26-mile run and cross the finish line on their own two feet.
The world's supply of fossil fuels has been dwindling for a long time. It's been easy to pretend this wasn't happening because there seemed to be an endless quantity of oil and gas reserves. How could we ever run out? All we had to do was drill another well or lay down another pipeline. But now it seems that ineffective public policies and naive consumer practices have amplified the effects of two critical factors: an exploding global population and surging demands of thriving new economies in formerly developing nations.
The world is changing. Global populations continue to migrate to urban areas. These ongoing relocations have a profound impact on deeply interconnected environmental systems and also lead to substantial distortions in human biosystems. In a word and to no one's surprise, living in big cities comes with a big cost in terms of our health and well-being.
The human body is remarkably resilient. Your body can withstand a great deal of abuse. It bounces back to fight off many infections, repair strains and sprains, and heal broken bones. You may drive hundreds of miles in a day, fly across multiple time zones, and travel to other countries and other continents. Your body manages it all, keeping you healthy and on track. And then one day it doesn't.