Riding in the summer heat can turn a dream ride into a survival mission if you don’t fuel and hydrate correctly. In this episode, we're joined by returning guest and sports performance nutritionist, Dani Hofstetter, to break down how to fuel and hydrate smarter for hot weather training and racing.
From carb absorption to sodium losses, cramping, gut tolerance, sweat testing, and post-ride recovery, Dani shares practical strategies to keep you fast, fueled, and functional when temperatures soar past 30°C.
You’ll also hear listener questions answered on topics like whether to switch to plain water mid-ride, how to balance solids and liquids, and how to adapt fueling for long, unsupported gravel rides. Packed with pro tips and real-world examples from long distance races like an Ironman, Badlands, Ötztaler, to the Cape Epic, this is your ultimate hot-weather fueling guide.
CHAPTERS
00:00 – Intro
04:21 – Quickfire round
08:32 – Listener Q: Should you switch to water in the heat?
10:38 – Carb concentration adjustments based on temperature
11:10 – How under-hydrating backfires: gut distress & thicker blood
12:46 – Subtle signs of dehydration
14:29 – Listener Q: Does craving water mean you've overdone the mix?
15:54 – How to calculate your sweat rate
17:35 – Setting up hydration for long unsupported ultras
18:53 – Balancing carbs, fluid, and electrolytes
19:16 – Listener Q: How many carbs/hour for amateurs vs pros?
20:28 – Adjusting fueling plan in the heat
21:15 – Listener Q: Nutrition for cramp-prone riders
22:14 – Why dehydration is a bigger cause of cramps than magnesium
23:46 – Listener Q: Solids vs liquids in hot weather
24:44 – Is gel + water better than drink mix?
25:33 – What to pick at a hot feed zone: Coke, fruit or salt?
27:21 – Palate fatigue and why taste matters
29:33 – Listener Q: Are sweat/sodium tests really helpful?
32:13 – Sodium vs salt: key numbers explained
34:06 – Replacing sodium: what really matters
35:14 – Should you add salt to your bottles?
36:51 – Two key hydration rules every rider should know
37:22 – Listener Q: Post-ride recovery nutrition in the heat
38:24 – What to drink and eat after hot rides
39:35 – Why recovery is the \"work after the work\"
41:06 – Listener Q: Caffeine and spicy foods in hot weather
42:15 – Listener Q: Carrying extra hydration for long gravel rides
43:22 – Preloading sodium: how and when
44:56 – Listener Q: Training differently in a heat wave
45:56 – Final take: consistency, fatigue, and training timing
LINKS
Dani Hofstetter
Host: Soren Jensen
Castelli
Castelli's Hot Weather Collection
SEND US YOUR QUESTIONS
If you want your questions to be answered on air, be sure to submit your questions by sending us a message on social media or by email to podcast@castelli-cycling.com
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