Pacing an ultra is not about going slow. It is about going right. The Javadhu Hills Ultra runs through the rolling Eastern Ghats around Tiruvannamalai in December. Fifty kilometres for some. A hundred for the brave. Either way, your pacing plan is what separates a finish line photo from a long medical tent conversation.
The first principle: pace is effort, not speed
On a flat road race, you can lean on your watch. The pace number tells the truth. In the Javadhu Hills, the pace number lies. A 6:30 per kilometre on a flat tarmac and a 6:30 on a 6 percent gradient are different sports. The runner who chases pace gets dropped. The runner who manages effort gets through.
The honest currency in a hill ultra is heart rate or perceived effort. Pick one. Stick with it. For most runners, this means running the first 10 km at conversational effort, holding tempo only on flat or descending sections, and walking any climb steep enough that your breathing changes pattern. Walk every hill that earns it. Run every flat that allows it. That is the rule.
Set your zones before you set your splits
Use our STRIDD calculators to find your heart rate zones from a recent race or threshold test. Most ultra runners spend the first half of a hill ultra in Zone 2, drift into low Zone 3 in the middle section, and only push into Zone 3 to 4 in the closing kilometres if they have anything left. If you cannot speak in full sentences in the first hour, you have started too hard.
The 50K plan: three phases
Break the race into three. Kilometre 0 to 18. Kilometre 18 to 38. Kilometre 38 to 50. Each phase has a different job.
Phase one is patience. Aim for your easy long-run effort. If your average flat pace is 6:00 per kilometre, expect 6:45 to 7:15 with the climbs. Eat early, even when you are not hungry. Drink at every aid station. The first 10 km is where you decide if the next 40 are joy or suffering.
Phase two is execution. This is where the field thins out. Some runners surge. Some die quietly. You hold effort. You eat every 30 to 40 minutes. You walk every climb steeper than a stairwell. You run every descent in control. Your watch beeps will lie to you. Trust the breath. Trust the legs.
Phase three is honesty. You will know by kilometre 38 whether you ran phase one and two well. If you did, you can lift effort gradually. If you did not, your job is damage control. Walk the last three climbs. Eat. Drink. Do not crash chasing a number on the watch. A finish in 7:00 hours beats a DNF at 6:20.
What changes for 100K
Everything stretches. The 100K runner pushes pace targets back by at least 60 to 90 seconds per kilometre. Walk breaks become mandatory. Most 100K finishers in Indian hill ultras alternate between four minutes of running and one minute of walking from the start. Some use a six and one strategy. Pick yours in training. Do not invent it on race day.
Fuel intake also stretches. Plan for 60 to 80 grams of carbohydrate an hour and 500 to 800 mg of sodium an hour, for as many hours as the race takes. Some 100K finishers eat upwards of 800 grams of carbs across the full race. Practise this load in your long runs. The gut is a muscle. Train it.
The Javadhu specifics
The Tamil Nadu Eastern Ghats are warm and dry in December. Mornings start cool. Afternoons climb into the upper twenties. The terrain is undulating rather than mountainous. The climbs are short and frequent rather than long and brutal. This rewards a runner who can keep moving on rolling ground without burning matches on every rise.
Read our heat and monsoon guide for the South India December playbook. Hydration matters even in dry heat. Salt matters even more. You can feel cool and still be running on empty. Trust the schedule, not the sensation.
Walk discipline is a skill
The faster you can transition between run and walk, the faster your ultra finish. Practise it. Set a watch interval. Run four minutes, walk one. Or run a flat section, walk the climb. The runners who lose time on hills are not the ones who walk. They are the ones who walk slowly and start running slowly. Walk fast. Run easy.
The mental side of pacing
Your watch is a tool. Your brain is the boss. By kilometre 30 you will want to do one of two things. Push because you feel good. Stop because you feel bad. Both impulses are usually wrong.
Build a checklist for the dark patches. Drink. Eat. Walk a hundred metres. Reset breathing. Look at a tree, a stone, a temple gopuram. Pick one small task and do it. Then another. An ultra is a chain of small tasks, not a single long suffering. Whoever taught you this lesson, return to it now.
I tell every athlete I work with the same thing. Build a vocabulary for the bad patches before you need it. Names for the climbs. A song you can repeat in your head. A face from home. A finish line you have visualised so many times you can describe the smell. The runner who can talk to themselves is the runner who finishes.
The last 5 km
This is the only place you push pace if you can. Save the speed for here. If your heart rate has held steady, you can let it climb. If you have eaten on schedule, you can stop. If the climbs are behind you, you can run the flats hard. A controlled finish is a sign that you paced the day correctly. A staggering finish is feedback for next time.
Build a plan that fits you
Pacing strategy without a training plan is just hope. Use our STRIDD plan generator to build a Javadhu Hills block tuned to your distance choice and current base. Browse the ultramarathon plan templates if you want to start from a proven shape. And for ongoing ultra reading, the STRIDD Running Lab archive has the rest of the playbook.
December will come fast. The hills will not change. You can.