I have been using GU gels as a source of fuel during my runs for a number of years and wanted to explore alternate forms for my longer runs. I immediately fell in love with the GU Roctane Ultra Endurance Energy Drink Mix! “GU Roctane Energy Drink Mix packs even more electrolytes and carbohydrates than GU Hydration Drink Mix”. It comes in many flavours. I quite enjoy the lemon berry (caffeinated) and grape (non-caffeinated). The flavours are subtle and not overwhelming. The beverage was also easy on the tummy. I was surpised that I didn’t require any additional sources of fuel during my longer runs. The GU Roctane Energy Drink was all I needed. During the cooler winter months, I noticed the beverage slightly freezes in my hydration flask and becomes a delightful frozen slushie. The perfect treat for longer runs! I highly recommend this product for those wanting to move beyond just gels.