Fuel Up With Sustained Energy. In order to perform its best, your body needs energy. To help provide that energy, PowerBar has taken the POWERBAR® Performance and POWERBAR® Energize bar and improved it by using cutting edge sports nutrition science to provide a specific 2:1 carb blend that delivers more sustained energy to muscles. That improved energy delivery is called C2 MAX and it equals optimized nutrition that fuels performance at a whole new level.