For Sentry Jiu-Jitsu Members. Download the Sentry Jiu Jitsu App today! From this mobile app you can view class schedules, membership information, ongoing promotions, and payment history. In addition, the App will provide you with tutorial videos and pacing of class curriculum to keep you sharp even when you can’t be on the mats. Visit our Academy Store to purchase official gear and look as sharp as your Jiu-Jitsu. You can also use the app to register in advance for classes, special events and seminars as well as our Parents Night Out events. Optimize your time and maximize your Sentry Jiu-Jitsu experience.