This is partly caused by low levels of blood glucose. GU is a unique blend of carbohydrates, amino acids, and energy enhancing herbs in a gel form. Food and energy bars have to be digested, so you won't get the benefits for 30-45 minutes. Not to mention, digestion pulls blood away from your muscles where you really need it for those explosive volleyball moves. Before and during practice - You just got out of class or work and have to go to practice.
Every point counts in a match.
A couple GUs before the match will give you the energy for a good warm up and a solid performance. As the match grinds on, and you've taken your fair share of jumps, swings, and digs, a GU in between games or during a time out is a great way to keep you pumped and in the game. GU gives you that extra lift you need for the game winning kill, block, dig, or serve. A full day or two of tournament play is a marathon for volleyball players. Proper nutrition is critical for performing your best.