Greetings: Many of us rely on gels to gain nutrition during races and training, and even for post-exercise rebuild. They represent another great step in the evolution of feeding the machine that propels us forward.
Below is a link that suggests more recent twists on the central theme of portable nutrition. I for one have taken to blending my own gel from natural ingredients, and many of these are pre-packaged versions of that idea.
No matter the form, always strive to maintain your nutrition throughout an event and give your body what it needs at the right time. This will help increase endurance, reduce discomfort and provide for a better overall experience.