Cardiomyocytes are similar to skeletal muscle because:
they beat involuntarily
they are used for weight lifting
they pulse rhythmically
they are striated

they are striated

Explanation:

The skeletal muscle is controlled at will through the somatic nervous system. Most of it is attached to bones, that allow us to move the bones and lift objects. Also, the skeletal muscle is a form of striated muscle.

The cardiomyocytes are the cells that form the cardiac muscle, also a type of striated muscle tissue. In contrast with the skeletal muscle, cardiac muscle is an involuntary muscle that contracts by the electrical stimulation created by cells of the sinoatrial node.

In conclusion, their similitude is being a type of striated muscle.