Many people find this a lot of fun, and other really struggle with it. The idea is we 'mute' the count and just strum the off beat, as shown.
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Reggae 'off beat' strumming
Muting is used in all genres and is worth getting used to, This pattern is used in most reggae songs, including Natural Mystic from this level of the beginners course. Make the strums as short as you can to make it sound really authentic!
Exercise - Play down strums on every off beat, and mute either straight away (Reggae style) or on the beat.
Strum any chords you like for the whole drum track. I recommend playing 2 bars of Am then 2 bars of Dm!