I started with soccer, so I created a simple soccer ball logo myself for the first version, see image. Since I added other sports, the current logo won't do anymore. I'm a fan of Jenkins logo (totally unrelated product, https://en.wikipedia.org/wiki/Jenkins_(software)#/media/File:Jenkins_logo_with_title.svg) and what I had in mind, is a cartoonish coach yelling with a (physical) tacticboard in hand. However, the logo should work in fairly small format as well, since coachaide.com works on all devices and screensizes. The logo needs to in .svg format.

Coachaide