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This doesnt seem right, I thought, looking at my watch.

The little race predictor widget on myGarminEpix read TCS London Marathon: 3W, 3:35:16.

Garmin Forerunner 165

That stands for three weeks away, predicted time: three hours, 35 minutes, 16 seconds.

It made me more than a little nervous.

However, its the Race Predictor tool thats vexing me at the moment.

The Garmin Forerunner 165 on a wrist

Asking the experts: What does Garmin say?

This should be treated as a guideline and not a hard prediction.

VO2 Max is a simple fitness metric that measures how much oxygen your body can use while you exercise.

London Marathon runners

The higher your VO2 Max, the more oxygen your body can use.

I think I know why.

We’d just meet up on the day, compare numbers, see who wins, and go home.

In addition to Garmin’s margins for error, marathons are complicated beasts.

The weather might be awful.

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