Drinks are our favorite endurance fuel for a few reasons.
#1 Ease of use.
Drinks are easy to mix up and easy to use whether you're running, biking, or swimming. Even if you drop your bottle, you can pick it up and keep sipping, no harm no foul.
#2 Easy on the Gut, Easy on the Pallet.
Your gut bomb risk drops dramatically with liquids. Unlike solid foods, your digestive system is able to respond better to liquids.
For most endurance athletes, drinks are also much easier to stomach because the texture is more palatable. Even after a long hard day, drinks will still go down smooth and easy.