This item is not in the library — it is a part of: J. Agrell, Improvisation Games for Classical Musicians.
One player. When practicing scales or other technical materials, hear the metronome click on two and four instead of on one and three. Once you get the hang of it, brag to your friends that you have a special metronome that clicks on the off beats, and then demonstrate. They may want to know where they can get one, too.
The description above is by Jeffrey Agrell, taken word for word from the source (p. 82).
The activity is a popular exercise among drummers and may also be known as "Moving Click". Here e.g. presented by Benny Greb:
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