The San Diego event will commemorate the 50th anniversary of Jim Ryun's sub-4-minute mile performance.
Check out these great shots of the annual event!
The track athlete took nearly seven minutes off the previous mark.
The marathoner is incorporating the cross-training tool into his weekly routine.
Some big names came out for the third-annual event.
She is turning to an outdoor running machine to help her stay healthy.
We caught up with the fastest 5,000m runner in the U.S. this year.
The world championships finalist will move up to the marathon this fall.
New products, rainy daze and trail races. There's a little something from every runner in today's photo gallery.