Blueberries are a great snack.  You can mix them up with greek yogurt and some honey.  You may also add them as a complement to your existing breakfast, for example, adding them up with some cereal. 
 
They squirt juice as you bite them down with a pleasant taste of sweet plus slightly acid. 
 
Furthermore, blueberries are very healthy food with lots of anti-inflammatory and antioxidant compounds, making them great for people who love doing lots of sport.