We released our workout tracker app Ignite on the App Store this week. These are the icons we did for the website. Ignite was one of the first projects we used Sketch for. Not only for the main UI, also for the icons. It took a little time to get used to Sketch's pen tool and pathfinder tools but it was a good exercise (no pun intented). We're pretty happy with the way these worked out (pun intented). We like how they have the same style as the tab bar icons in the actual app.
App Store link