Wonder Core Slide Fit Welcome to the journey with Wonder Core Slide Fit! Slide Fit comes with an exclusive APP for visual tutorials. You can access training courses created by professional fitness coaches. You can learn to do more than 30 kinds of workout movements. The movements are classified clearly and customized from beginner to advanced levels. Squat, ab tuck and ab roll can all be done with one device. It only takes you a few minutes every day to train the muscles you want. With Sli