My guess is better nutrition and lots of hydration beyond sugary stuff. Protien will help you endure!
Another suggestion is better said in the Old Bull, Young Bull story:
"The old bull and the young bull were standing at the top of the hill overlooking a paddock of many gorgeous young heifers. The young bull said "Let's charge down the hill, knock over that fence and each service one of those heifers". The old bull replied "Why don't we saunter down the hill, open the gate, take a sip at the water trough and then service ALL of those heifers??"
In other words don't go all out at first it's not how fast you can be but it's can you finish the ride. Slow down and enjoy yourself!
Life is like a 10 speed bike, we all have gears we never use.
Charles Schultz
"The bicycle is just as good company as most husbands and, when it gets old and shabby, a woman can dispose of it and get a new one without shocking the entire community." — Ann Strong, Minneapolis Tribune, 1895