Gels offer endurance athletes a quick shot of energy so they can remain at their peak. Throw a few gel packs in your bag or jersey pocket and you can shake off that tired feeling and keep hammering away. Replenishing electrolytes, delaying physical and mental fatigue, and aiding in recovery can all be accomplished through quickly digested energy gels. There are an immense amount of flavors some even contain caffiene, acting as a shot of espresso to fuel you through your ride.