Eli5 – Why does music come in bars of four instead of 5/10?

Question

Recently I’ve been attending a lot of gym classes and the counts are always 4, 8, 16 etc. It made me wonder why music is set out this way and not in 5’s and 10’s like I would expect. Or am I missing something obvious?

In: 23

Answer 1

Your heart beat establishes rhythm. Very little in nature aside from your digits comes in 5s or 10s.