The Hennur Bamboo Half runs through a forest pocket on the north-east edge of Bengaluru, and it runs in August. August in Bengaluru means monsoon. So pacing this race is not really a splits problem. It is a conditions problem, and conditions problems are solved with a checklist, not a hero pace. Work the steps below in order. Each one feeds the next, and by the end you have a pace plan you can actually run on a wet Sunday.
Step 1 — Lock your three baseline numbers
Before you pick any target, write down three things. Your most recent half marathon time. Your last 10K time. Your average weekly mileage across the last twelve weeks. Three numbers, on paper, where you can see them.
Why these three? The half time tells you what you have done at the distance. The 10K time predicts what you could do if you had not. The mileage tells you whether the prediction is honest or a fantasy. If you have not raced a half in the last six months, take your 10K time and multiply by 2.2 to 2.3. That is your honest predictor. The STRIDD calculators run this conversion and hand you a pace band instead of a single number, which is the format you want.
Use a band, not a single pace
A single target pace gives you exactly one thing to do on race morning: fail against it. A band gives you a range to live inside. Say 5:10 to 5:25 per kilometre. On a dry, cool stretch you sit at the fast end. When the rain comes at kilometre 8, you drop to the slow end and you have not broken anything. The band is the accessibility feature of the whole plan. It works whether your morning goes perfectly or not at all.
Step 2 — Apply the monsoon adjustment before the start
August in Bengaluru typically sits between 19 and 26 degrees Celsius, with humidity in the 75 to 90 percent range. Rain on race morning is common, not rare. This matters because humidity raises your heart rate at the same workload. Same effort, faster pulse, quicker fade.
The humidity number
Add 5 to 10 seconds per kilometre to your dry-weather target. Do this before you start, not after you blow up. If you ignore it through the first 5 km, the final 5 km collect the debt with interest.
The rain protocol
If it is raining, slow another 5 seconds per kilometre on top of the humidity adjustment. The Hennur lanes get slick and the forest sections hold water. A fall at kilometre 12 costs you far more than ten careful seconds ever would. The STRIDD heat and monsoon guide has the full wet-weather protocol if you want the longer version.
Step 3 — Cut the course into three sections
The route wraps through forest pockets and rolling terrain near Hennur. It is not flat. Treat it as three jobs, not one race.
Kilometres 0 to 7 — settle, do not race
Dense crowd, cool monsoon air, fresh legs. Every cell in your body wants to go. Do not. Hold the slow end of your band. You are warming up in public.
Kilometres 7 to 16 — hold the middle
This is the long working section through the rolling forest stretches, and this is where pacing discipline shows or it does not. Sit in the middle of your band. Take a gel at kilometre 10. Drink something at every aid station you pass, even a mouthful.
Kilometres 16 to 21 — spend what you saved
The closing five. If sections one and two were honest, you have headroom here and you push toward the fast end of the band. If they were not honest, this is the part you grind. The course does not give the time back. It only tells you whether you earned it.
Step 4 — Run the fuelling protocol
A half is the shortest race where fuelling decides the back end for most runners. Under 90 minutes you can fake it. Over 90 minutes you cannot.
The schedule
- 30 minutes before the gun: 200 to 300 ml of fluid with electrolytes.
- Kilometre 6: first sip from your handheld or an aid-station cup.
- Kilometre 10: one gel, with 100 to 150 ml of fluid behind it.
- Kilometres 12, 14, 16, 18: a sip at each station.
- Kilometre 16: a second gel if your goal time is over 1h45.
None of this is new on race day. The STRIDD half marathon plan builds fuelling rehearsals into the long runs so your stomach has already met the gel.
Step 5 — Run the watch like a tool, not a feed
Pacing should run quietly in the background while your attention goes to running well.
The screen
One screen. Three fields. Current pace, average pace, heart rate. That is the whole layout. Distance, elapsed time, cadence: hide them. They are distractions for the first 18 km.
The 5-kilometre check
Every 5 km, glance at average pace. Faster than the slow end of your band? Ease off. Slower? Hold steady, do not chase. Chasing a slow split is the single most reliable way to fade in the back third.
The decision at kilometre 18
At 18, you make one call. Legs and breath still there: push toward the fast end. Not there: hold form and finish. It is a yes or no. Halfway between push and hold is the worst answer on the menu.
Step 6 — Build a humidity block in the four weeks before
Even runners who live in Bengaluru benefit from deliberate humidity work. August conditions are heavier than the cool-morning miles most of us bank.
The four-week protocol
- Weeks 4 and 3 out: one long run a week with sustained tempo segments, run in the warmest part of the day.
- Week 2 out: two runs in humid conditions, with full fuelling and hydration practised.
- Week 1 out: taper the load, keep one easy run in the heat for exposure.
- Race week: short, easy runs only. Hydration discipline stays.
Heat adaptation builds across roughly 12 to 14 days of consistent exposure. Once built, it holds for two to three weeks before it fades, which is why the timing matters.
Step 7 — Close the loop on race-week logistics
Open the Hennur Bamboo Half event page on the Monday of race week. Bib pickup, start corral, route specifics live there. Scout the start area on Saturday so Sunday morning is not spent navigating.
The night before, lay it out and walk away. Kit out: shoes, socks, shorts, top, cap, bib. Watch charged, GPS confirmed. Two alarms. A tested breakfast plan, not a guess. Bottle filled. Then go to bed.
Step 8 — Your next step
Open the STRIDD plan generator, enter your race date and the days you can train, and let it build the 10 to 12 weeks the race actually needs. For more on monsoon racing and Bengaluru-specific training, the STRIDD Running Lab archive has the rest.