Thumbs up to corporations exercising responsibility--particularly when it can promote exercise.

Got old athletic shoes? Put them to good use. Help Nike turn old sneaks into playing surfaces within our community. The company's program has turned more than 19 million pairs of unwanted shoes into so-called "Nike Grind" for that purpose -- notable spots here in San Francisco include a basketball court in Hunter's Point and the first tee at Harding Park golf course.

Until May 30, you can take your old athletic shoes to the Union Square Niketown (Post at Stockton). Hey, better turned into something many can enjoy than languishing in the bottom of your closet, under your bed, stinking up a locker, or polluting a landfill somewhere.