My First Garmin Coach Benchmark Run for Half Marathon Training After 40
Yesterday evening, I started something new.
I began a Garmin Coach half marathon training plan.
The plan is scheduled to end on November 15, and it is a 20-week plan. I do not know exactly how my body will respond over the next few months, but I wanted to give myself a clear goal.
This was the first workout in the plan.
Garmin called it a benchmark run.
It was short, but it was not easy.
The workout was simple:
2 minutes of warm-up.
5 minutes of running at a faster pace.
2 minutes of walking or light jogging.
That sounds easy when I write it down.
But during the workout, it felt very different.
The main running section was only 5 minutes, but the target pace was around 4:11 per kilometer. I tried to follow the plan, but it felt much harder than I expected.
After the hard 5-minute section, Garmin suggested walking or jogging lightly for the final 2 minutes.
I chose to walk.
I did not feel like jogging at that point.
Maybe I have not trained enough recently.
Maybe my body was not ready for that kind of pace yet.
Either way, the benchmark run gave me a clear message:
This plan is going to challenge me.
Here is the key data from my first Garmin Coach benchmark run.
| Metric | Data |
|---|---|
| Workout Type | Garmin Coach Benchmark Run |
| Distance | 1.72 km |
| Total Time | 9:18 |
| Moving Time | 9:15 |
| Average Pace | 5:25 /km |
| Best Pace | 3:51 /km |
| Average Heart Rate | 155 bpm |
| Max Heart Rate | 189 bpm |
| Training Effect | Anaerobic Capacity |
| Aerobic Effect | 2.4 |
| Anaerobic Effect | 2.4 |
| Training Load | 94 |
| Impact Load Distance | 2.71 km |
| Actual Distance | 1.72 km |
| Average Cadence | 168 spm |
| Stride Length | 1.07 m |
| Ground Contact Time | 245 ms |
| Average Temperature | 28.0°C |
| Perceived Effort | 5/10 Hard |
The numbers show that this was a short workout.
But my body did not experience it as a small workout.
My average heart rate was 155 bpm, and my max heart rate reached 189 bpm. Garmin marked the training effect as anaerobic capacity, which makes sense because the fast 5-minute section felt very intense for me.
This was not a long run.
But it exposed something honestly.
I still have a lot to build.
Recently, I thought I had been running more consistently. I had several easy runs, slow runs, recovery runs, and weekly running notes. But this benchmark run showed me that running comfortably and running fast are very different things.
A 30-minute easy run and a 5-minute fast effort ask different questions from the body.
Yesterday, my body answered clearly:
I need more training.
That could feel discouraging.
But I do not want to see it that way.
This was not a failure.
It was a starting point.
A benchmark run is not supposed to prove that I am already ready.
It is supposed to show where I am now.
And now I know.
I can run.
I can keep showing up.
I can build consistency.
But if I want to prepare for a half marathon, I need to improve my endurance, speed, strength, and recovery.
As a runner after 40, I think this is important.
I do not want to pretend that I am already fit enough.
I want to train honestly.
I want to follow the plan, listen to my body, and see how I change over the next 20 weeks.
The half marathon plan ends on November 15.
That feels far away right now.
But yesterday’s benchmark run made the goal feel real.
It also reminded me that a training plan does not start with confidence.
Sometimes, it starts with humility.
It starts with breathing hard after only 5 minutes.
It starts with choosing to walk during the final 2 minutes.
It starts with realizing that I have more work to do.
And maybe that is exactly why this plan matters.
This first benchmark run was short.
It was hard.
It was honest.
And it gave me a starting line.
Related notes from my Garmin Coach journey:
Running After 40 
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