Eighth note triplet rhythms are three evenly spaced strums within one beat.
One bar of eighth note triplets in * time would consist of four groups of three strums.
There are 12 strums per bar but still only four beats.
Accent (play louder) the first downstrum of each group of three strums.
Play the following rhythm pattern holding a C chord.
Now use the triplet rhythm pattern on a chord progression.
This example uses a triplet rhythm on the second beat only.
This one uses a triplet rhythm on the second and third beats.