Trying gels during training is fundamental, these are concentrated forms to which our body is not accustomed, so as you train your muscles, you must also train your digestive system.
There is a very important difference between one formulation and another, it is concentration:
a gel with an ISOTONIC label specified, you can take it without drinking any water immediately after, because it has a concentration useful to pass quickly the digestive system without attracting liquids (the blood that is in the muscles).
If there is no specification about osmolarity, and the volume is 25 ml, you have to take it with a sip of water immediately after.
Dott.ssa Annalisa Faè, R&D ProAction