How I Got 10K-Ready in 3 Weeks (By Slowing Down)

Here’s my three-week training plan that got me from a low-activity lifestyle to an honorable 10K race

I’m not exactly a beginner. I’ve trained for and completed races in the past, ranging from 3K up to 32K. But I’ve definitely been de-trained - I haven’t really run consistently in the last couple of years. (My Strava would probably show, at best, one run per month.)

I recently completed a 10K race, and while I wasn’t as fast as I was 13 years ago, I was able to finish it proudly following this three-week training plan.

Summary

(Click to see image)

Details of the Plan

My goal was simple: get 10K-ready without getting injured.

The last thing I needed was to let my ego take over and run like I was 13 years younger and 30 kg lighter. 😅

So I focused on rebuilding my aerobic base - meaning a level of effort I can sustain for a long period of time.

What this means in practice:

• I run slower (especially during training)
• But I can go longer
• And if I speed up, I have a baseline to recover to (without completely walking)

WEEK 1 - GETTING BACK

Day 0: The Reality Check

I walked 10 km. 😄

OK, this wasn’t really part of the plan. But my wife had already registered us for a 10K, and I just wanted to see if my legs could still go the distance.

Day 1: Interval Run

Interval training means alternating between high intensity and low intensity.

I started with a 4-1 interval:

• 4 minutes run
• 1 minute walk

My goal was to gradually increase how long I could run between walk breaks.

During runs, I capped my Heart Rate (HR) at 155 bpm*** - meaning I would intentionally slow down whenever I went over.

***Quick note on HR (based on my experience) before I continue:

I’ll mention HR a lot here because it was a key part of my training. If needed, consult your doctor or a running coach.

For me:

• Max Heart Rate (observed in previous runs): ~181 bpm
• 155 bpm is around 85%

Rough zones I followed:

• Easy to Moderate (50–70%): ~130 bpm
• Zone 3 Aerobic (70–80%): ~145 bpm
• Zone 4 High (80–90%): ~160+ bpm
• Zone 5 (90–100%): reserved for race efforts

Day 2: Interval + Strength

I added a simple leg strength circuit:

• squats
• reverse lunges
• glute bridge
• plank

Then another 4-1 interval x6.

My legs are not what they used to be, so I wanted to rebuild strength alongside endurance.

Day 3: Interval Run

Same thing: 4-1 interval x6, HR cap at 155 bpm. Consistency over intensity.

Day 4: Extending the Continuous Run

Before training, my limit was ~15 minutes continuous run then I’d struggle to go beyond 5 minutes after stopping on walk breaks.

So I started expanding:

• 15-minute run -- I would realize later this was more of a psychological limit
• 2-minute walk
• then another 10-minute run

WEEK 2 - GOING THE DISTANCE

Day 1: Easy Jog

20-minute continuous jog, HR: 145-152 bpm

It felt easy… but I forced myself to stop at 20 minutes.

Day 2: Interval Progression

Increased my interval to 5-1 interval x6

Same HR cap: 155 bpm

Longer runs but with the same control.

Day 3: Continuous Run

25-minute run at slightly higher effort than the easy jog (~155 bpm)

Day 4: Confidence Run

This was my only “long run” before race day. I didn’t want to force distance since I only had 3 weeks.

So I combined previous sessions:

• * 20-minute continuous run (HR cap 155 bpm)
• * then 4-1 intervals until I reached 8 km

I was able to maintain breathing and control all the way. That surely gave me confidence.

WEEK 3 - TAPER WEEK

Never underestimate a good taper. You want to run more… but you don’t. So that on race day, you’re just itching to go.

Day 1: Easy with Pickups

• 20-minute easy run (HR cap 145 bpm)
• 20-second pickups x3

Day 2: Very Easy Jog

15-minute jog with HR cap at 140 bpm

Day 3: Shakeout

This is the day before the race so I would say it was optional. However I wanted to do a short run mostly for confidence.

10-minute light run at ~145 bpm

Day 4: Race Day!!!

I actually had a different strategy planned when I first wrote this out… but I adjusted during the race because I felt stronger than expected.

My actual race day strategy:

• 0 KM to 2 KM: 6-1 Interval, with HR CAP 157 bpm
• 2 KM to 6 KM: 8-1 Interval, with HR CAP 163 bpm
• 6 KM to 8 KM: 10-1 Interval, with HR CAP 170 bpm
• 8 KM to 9.5 KM: Continuous Run, with HR CAP 174 bpm
• 9.5 KM onwards: Takbo hanggang kaya. Haha. Surely no more walk breaks. Tiny sprints when I could. Shorter and lighter strides when I couldn't. I wasn't monitoring HR anymore, just running until 10 KM.

Final Thoughts

You’ll notice I didn’t really talk about pace during training.

That’s because pace depends on your current condition. You might be faster or slower than me - but if you’re within your target HR zone, I would say you’re doing it right.

In many training runs, I felt like:

• “Kaya ko pa.”
• “I can still run another kilometer.”

But I chose to stop.

Actual 1KM Splits on Race Day

I believe that discipline - stopping when I should - was key to staying consistent and strong during the race.

While I didn’t achieve perfect negative splits, my pace was consistent throughout.

And my last kilometer was actually faster than my 8th to 9th.

I’ll take that as a win. 🙂

I hope you picked up something useful here.

If not, feel free to mix and match what works for you.

I only had 3 weeks (really just 2, since I tapered), but what if I had 6 weeks?

Maybe that’s a story for another blog. 😄

~ END. ~

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