Activity is not just for the heart: For older people, it spells longevity, mobility, independence. Exercise fights diabetes and MS; even extends the lifespan. Time to get moving?

Think all socks are created equal? Think about socks at all? A few scientists that think with their feet say choosing the right pair of socks is a major feat. Indeed!

The Why Files looks at kinesiology, sports medicine, psychology and some ancient Olympic history, brought to life.

What is EPO? What are steroids? Do steroids cause aggression? Are steroidal athletes bad role models? Are we over-reacting to steroid use?

Armstrong wins historic 7th Tour de France. How do endurance athletes prepare for Tour de France? Marathon? Ironman?

It’s not just football. Hockey and biking are dangerous sports too. What are the real dangers of our athletic obsessions? What is the link between concussion and depression later in life?

Throw a curve ball. Evade the rainstorm. And don’t get mouth cancer. It’s all in an afternoon’s ball game.

Airbus crashes in New York — composite material fails and tail fin falls off. Why are composites (usually) so strong? How are they used in roads, bikes and planes?

Doping clouds cycling and other sports. What drugs are in use? How do athletes avoid detection? What is the real harm of steroids?