NFL, NBA, NHL, and MLB Highlights.
Some questions you may have:
Q: What editing software do you use?
A: I use Camtasia 3 and Final Cut Pro X on Mac.
Q: How do you make sports videos?
A: It is a long process, but essentially you have to convert youtube clips to MP4 videos. Then, you can import those clips into your editing software. You can cut the clips up and compile them, and export your final product.