Really, you can count the pulse or beat of music however you want. Time signatures like 3 beats to a measure, or 4 beats to a measure, are constructs that are specific to different styles of music and cultures. These subdivisions can help musicians and dancers by emphasizing the repeating patterns in the music – so like, a certain piece might have a repeating pulse every 3 beats, so you might represent that piece as “in 3” and count three beats to a measure – but that isn’t really integral to the music, you can count it however you want. Music outside the western notational tradition can group pulses very differently. Indian music uses a tala that is much longer than a western measure and has subdivisions, but not necessarily the same length. So they might be counting in 14 (4+3+4+3) or 7 (3+2+2). Other systems have asymmetric pulses – for example some Balkan dances have a quick-quick-slow-quick-quick repeating meter: five repeating beats but the middle one is longer.
Probably the reason the counts are usually in 4 at your gym classes though, is that a lot of western music is in 4
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