Bentong Marathon 2026 Fuel Plan for the Hilly 42K

For the Bentong Marathon 42K on 28 November 2026, plan on about 60 g of carbohydrate an hour from the first 30 to 45 minutes, drink to thirst from the water stations, and add sodium only if your own sweat numbers call for it. On a hilly course, pacing the climbs will decide your race more than any gel.

The race is officially the Bentong Monsoon Marathon, starting and finishing at Padang Sekolah Janda Baik in Bentong, Pahang. Below is what we could confirm, what we couldn’t, and a fuel plan that holds up either way.

What do we actually know about the Bentong Marathon 2026?

We checked the official registration page on 14 October 2026. Here is what it states:

• Event: Bentong Monsoon Marathon 2026
• Date: Saturday, 28 November 2026
• Venue: Padang Sekolah Janda Baik, Bentong, Pahang
• Categories: 42 km, 21 km and 12 km
• Organiser: Majlis Perbandaran Bentong
• Field: 3,000 slots, with registration shown as closed

Here is what we could not verify. The page lists “1.30 AM” under event details without saying whether that is a flag-off time, and its flag-off, route map, cut-off and elevation sections are empty. It also doesn’t say where the water stations are or what they serve. We’ve built this plan around roughly 900 m of climbing for the full marathon, but that figure is not on the official page, so treat it as provisional until the organiser publishes a route.

We’ll update this guide when the race pack details come out. Until then, plan for the worst reasonable case: a dark start, hills, rain, and water stations that offer water and an isotonic drink and nothing else.

How is Bentong different from a city marathon?

Bentong is different because of the climbing and the weather, and both change how long you’ll be out. Janda Baik is a hill village off the Karak Highway, and a marathon with anything like 900 m of ascent will be slower than your flat PB. Fuel targets are per hour, so more hours means more total carbohydrate to carry or collect.

November is also in the name. Expect a real chance of rain. That cools you down, which is good news, but it lowers your sweat rate too, so the drinking habits you built in hot KL long runs may overshoot here.

If you ran KLSCM earlier this season, Bentong makes a good second marathon. Just don’t copy that plan line for line.

What should you eat in the days before?

Eat more carbohydrate for 36 to 48 hours before the race. The joint ACSM position statement suggests carbohydrate loading at 10 to 12 g per kg of body weight a day over that window for events longer than 90 minutes (Thomas et al., 2016). For a 65 kg runner that’s 650 to 780 g a day, which is a lot more rice, bread and noodles than most people expect. Cut back on fibre and fat a little so it fits.

The same statement suggests a pre-event meal of 1 to 4 g of carbohydrate per kg, eaten 1 to 4 hours before you start. If the 42K really does start in the small hours, the timing gets awkward. Two workable options:

• Eat a proper meal the evening before, then a small snack 60 to 90 minutes before the start: two slices of bread with kaya, or a banana and a sports drink.
• Wake up early and eat a bigger breakfast 2 to 3 hours before: only if you’ve practised eating at that hour on a training day.

Whichever you choose, rehearse it once in November on a long run with the same alarm time.

What is the hour-by-hour fuel plan?

The plan is about 60 g of carbohydrate every hour, started early and timed around the climbs. Most recreational runners will take 4.5 to 6.5 hours on a hilly marathon, which puts them in the over-2.5-hour band where 60 to 90 g an hour applies (Jeukendrup, 2014). Start at 60 g. Go higher only if you’ve trained your gut for it; our guide to carbs per hour for running explains how.

Walk the steepest climbs and eat while you walk. Your stomach copes far better at power-hiking effort than at the top of a hard push, and you lose very little time. Use the descents to drink, not to eat.

To count what you carry: multiply your expected hours by two and add one spare. A 5.5-hour runner carries 12 gels if the aid stations offer nothing else, or fewer if they serve sports drink and bananas you’ve tested.

How much should you drink at Bentong?

Drink to thirst. The ACSM fluid position stand gives 0.4 to 0.8 litres an hour as a starting range, to be adjusted to the individual (Sawka et al., 2007), and on a cool, wet morning in the hills many runners will need the lower end.

The risk on a rainy course is drinking too much, not too little. The international consensus on exercise-associated hyponatraemia names overdrinking as its main cause and recommends drinking to thirst (Hew-Butler et al., 2015). If you finish heavier than you started, you overdid it.

Two checks worth doing before race day:

1. Weigh yourself before and after a 2-hour long run in conditions close to race morning. Add the weight lost to what you drank. That’s your sweat rate in litres per hour.
2. If it rains on a training morning, measure again. The difference tells you how far to dial back on race day.

Our article on hydration in Malaysian heat has more on reading those numbers.

Do you need sodium for Bentong?

It depends on your numbers, and for many runners the answer will be “not much”. A marathon is where planned sodium starts to make sense for runners who sweat heavily, sweat salty and drink back most of their losses. Cool, wet weather pushes most people the other way.

Sports dietitian Alan McCubbin’s modelling found sodium replacement unnecessary in every realistic elite-marathon scenario, and only clearly needed when long exercise met heavy drinking and salty sweat (McCubbin, 2022). A five-hour runner sits between those cases. Our guide to sodium per hour for runners shows how to work out your own figure.

What goes in the race bag?

• Gels for your expected hours times two, plus one spare
• Your own soft flask if you want to drink between stations
• A light rain shell or poncho for the start, if the forecast shows rain
• A headlamp, if the flag-off turns out to be before dawn
• Sodium, if your numbers call for it: for example our Elec Stamina caplets, which list 220 mg of sodium each and are taken with water, one per 500 ml drunk
• Anti-chafe balm. Wet shorts plus 42 km is a combination nobody forgets
• A dry shirt and a salty snack in your finish bag

What should you check at race-kit collection?

Before race day, get answers to the gaps on the official page. Ask or check the race pack for:

• The exact flag-off time for the 42K
• The cut-off time, and any intermediate cut-offs on the climbs
• The route map and elevation profile
• How many water stations there are, roughly how far apart, and what they serve (water, isotonic drink, fruit)
• Whether cups are provided, or whether you need your own

If the stations are more than 5 km apart on the climbs, carry a flask. If only water is served, carry all your carbohydrate. Then adjust the table above to the real course, not the one you imagined from the medal photo.

References

1. Thomas DT, Erdman KA, Burke LM (2016). American College of Sports Medicine joint position statement: nutrition and athletic performance. Medicine & Science in Sports & Exercise, 48(3), 543-568. doi:10.1249/MSS.0000000000000852
2. Jeukendrup A (2014). A step towards personalized sports nutrition: carbohydrate intake during exercise. Sports Medicine, 44(Suppl 1), S25-S33. doi:10.1007/s40279-014-0148-z
3. Sawka MN, Burke LM, Eichner ER, et al. (2007). American College of Sports Medicine position stand: exercise and fluid replacement. Medicine & Science in Sports & Exercise, 39(2), 377-390. doi:10.1249/mss.0b013e31802ca597
4. Hew-Butler T, Rosner MH, Fowkes-Godek S, et al. (2015). Statement of the 3rd International Exercise-Associated Hyponatremia Consensus Development Conference. British Journal of Sports Medicine, 49(22), 1432-1446. doi:10.1136/bjsports-2015-095004
5. McCubbin AJ (2022). Modelling sodium requirements of athletes across a variety of exercise scenarios. European Journal of Sport Science, 23(6), 992-1000. doi:10.1080/17461391.2022.2083526
6. Official event page: Bentong Monsoon Marathon 2026 on Howei, checked 14 October 2026.