The Koko Smartrainer is a highly interactive fitness device that provides the user with real-time, portable fitness and training information. The system significantly enhances the motivation to increase strength and fitness. For example, the screen interface instructs the user to match a ‘bug’ representing the actual motion of the lifted weight with a similar reference recommending optimal range of speed and motion. Cooper Perkins developed the concept, the underlying technology, and prototyped the key technologies (US Patent nos. 8,105,207, 8,574,129).