Muscles have a bunch of nuclei because they need to use the DNA in the nuclei to make the large number of proteins that they must contain, so that they can relax and contract. What other organelle might muscles need a larger than normal number of? Centrioles, so that muscle cells can retain a rigid structure during times of heavy stress (for example: lifting a heavy weight).

Mitochondria, so that muscle cells can quickly respond to the need to relax and contract.

Vesicles, so that muscle cells can ensure water availability if there is unusually low availability of water.