If you have to run long distances, whether it be for training or for a race, it is a sensible idea to take some energy gels with you on the run, since your bodily stores will quickly be emptied. For this reason, you need something to refill the energy stores. In order to do so, you can, for example, use both gels or chews.
There is a difference between isotonic gels and non-isotonic gels. In short, isotonic gels have a more liquid consistency like juice and can be consumed without water, whereas non-isotonic gels should be consumed with water, as they are somewhat thicker in consistency.
If you want to further explore energy intake before, during and after running, you can read this article:
There are a lot of flavors and consistencies when it comes to energy products, and you can find out a little more about this in the video, where we taste 6 different common gels from GU Energy - one isotonic gel and two different flavours of chews also from GU Energy.
If you are interested in trying some of the products from GU Energy, you can buy them here: