Stride Nation

Profile of Kathy Martin, a master's runner who began running at age 30 and is now shattering national and world records.

As Jon Diflorio, her strength coach, put it in the video profile, "she can outrun teenagers." I would add that this woman, at age 60, can outrun fast teenagers. Amazing.

Alberto Salazar was featured on today's "Here & Now" program from WBUR. The piece includes his predictions for both women's and men's 2012 Olympic marathon times.

If you want to find signs of how your body is reacting to the stresses of training perhaps the most informative place you can look is the toilet bowl. The appearance of your urine and stool can be very informative on your physical condition, the quality of your nutrition/hydration and, most importantly, it can be a critical first sign that you need to seek medical assistance. This info-graphic has just about all the basic information you need to know.

ht Jill Will Run

This video features New York Times reporter Charles Duhigg discussing the mechanisms of a habit and how they work. It's of interest to runners as a great deal of training has to do with building good habits and breaking bad ones. Duhigg is the author of the book The Power of Habit that examines this subject in detail.

A study published this week in the journal Arthritis Care & Research suggests that physical activity is a key way to both reduce pain and increase joint flexibility. It also was shown to provide more support and protection for arthritic joints

"f you want to run, cycle or swim faster, at any distance, you have to train at a pace that is almost as fast as you can physically move."

Scientific evidence that short busts at max effort -- Potassium Pump Training -- can help endurance athletes come race day.