This episode of Gray Matters is "Movement Matters."  In the second half of life, we become increasingly aware that our bodies are not machines that will run forever, and we simply ignore them at our peril.  Our bodies are gifts, and we are responsible for keeping them (aka ourselves) strong and healthy.  We speak with an amazing 63 year-old woman who participates in Iron Man triathalons, and a 73 year-old woman who has a mission to keep hundreds of seniors fit.  These are terrific women who both inspired me and made it clear (without words) that I am a bit of a slug!