On Your Mark is an Android application designed for sprinters to practice their sprint start. The app is developed by b13 and is available for free in the Lifestyle category of the Google Play Store under the Sports subcategory.

With On Your Mark, users can simulate a real competition environment by pushing the start button and hearing the commands "On Your Mark", "Set", and a randomly set interval before a start sound. The app can also produce noise, adding to the realism of the experience. This allows sprinters to practice their sprint start in an environment similar to a real competition.

Overall, On Your Mark is a useful app for sprinters looking to improve their sprint start technique. However, it should be noted that the app only focuses on this specific aspect of sprinting and does not offer any additional features or training programs.