Catch me if you can!

It's exercise 4, and the hardest so far using DSLR. We have to catch a moving subjects very clearly, with a blurry background. But instead, most of our shots got steady background and the moving object was blurry. It took sometime when I finally got the correct one, 5 pics left. Luckily I got 3 good shots after hundred attempts and that's it, I got stucked. Doing this exercise was like "To Hell and back"!