Ding Dong 7

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To not make an error counting and for the group to count as far as possible.

All players walk on the spot.
The first player begins punting with number 1, the next player (counter clockwise) says number 2...
The first time a player needs to say number with a 7 (7, 17, 27...) or a multiple number of 7 (7, 14, 21....) then that player says "Ping." And the counting resumes in the opposite direction (clockwise).
All players jog on the spot
The next time the number has a 7 or is a multiple of 7 then the player does not say the number but says "Pong." And the counting resumes in the opposite direction and all players walk.
If a player makes a mistake they run around the circle once.
Counting begins anew with 1, 2... at the place the error took place.

Notes:
- Thanks for Andy Raithby for this idea
Variations:
- Use a different number than 7.
- For slightly larger groups begin at 2 or 3 different parts of the circle.