Fueling; the term used by cycling and I'm sure other sports participants for eating. I just say eating.
When you start attempting longer rides - over ninety minutes - energy levels become an issue. For my early rides I ate prior to starting, and then from shops during it. I couldn't always find a shop when I was hungry, or I didn't fancy what was on offer.
A previous post mentioned me lacking drive on the last part of a club ride; it was caused by not eating properly. I was so intent on keeping up, I forgot the food I had brought, and didn't fancy cake at the cafe we stopped at. You would have thought I knew better.
There are energy gels, bars and drinks.