This was a custom video:

This time only walking on the gravel along the side of the paved road on a dry day. Just as you did in this last video (especially between 10:40 and 15:35), you can walk partially on the gravel and on the pavement during the entire video. You got very successful with the little rocks by doing that. By walking normally and relaxed, you can increase your chances even more. I recommend alternating between further and closer views from behind :)

As an addition outside of the script, if by the end of the original 15 mins you ended with many rocks get...

This was a custom video:

This time only walking on the gravel along the side of the paved road on a dry day. Just as you did in this last video (especially between 10:40 and 15:35), you can walk partially on the gravel and on the pavement during the entire video. You got very successful with the little rocks by doing that. By walking normally and relaxed, you can increase your chances even more. I recommend alternating between further and closer views from behind :)

As an addition outside of the script, if by the end of the original 15 mins you ended with many rocks getting crushed by both of your boots, feel free to record another 5 extra mins just walking on pavement, just to appreciate the crushing noises on the pavement.

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