the Rules

You can only complete it on 21 June or 21 December

It must be done in your local time zone

You start at exactly 21:00. Not 20:59. Not 21:01. Start at 21:00

You must cover at least 21.00 kilometres

If your watch says 20.99, you’re not done

It must be one continuous run

You can stop briefly if needed, but no splitting it into multiple sessions

You cannot start early to get a head start

Nothing counts before 21:00

It’s a run. Walking is fine when needed, but this isn’t a stroll

You can do it solo or with others

Running with mates, clubs, or groups is encouraged

You can do it anywhere in the world

Outdoor runs count

Treadmill runs also count. If that’s safer or more practical for you, use it

Your route or setup is your responsibility

Use common sense. Stay legal. Stay safe

This runs on honesty. If you say you’ve done it, make sure you actually have

If you’re looking for loopholes, you’ve missed the point

This is a 9pm start. For the Winter Half, that’s proper darkness. The Summer Half, it can still catch people out

You are responsible for yourself

Pick a safe route or environment

Run with others if you can

Wear something visible if you’re outside

Use a head torch if needed

Take a phone

Tell someone what you’re doing

Avoid places that don’t feel right

If outdoor running at night isn’t safe for you, use a treadmill. That’s absolutely fine

If conditions are bad, don’t force it. There’s always another one in six months

You take part at your own risk

Sean Conway and the organisers accept no responsibility for anything that happens before, during, or after your run

You are responsible for your health, your decisions, and your safety