While "ideal" is somewhat subjective, there is a tool designed for this purpose, a "meat masher" or "meat chopper" (names vary). This is a tool resembling a nylon spatula, but with a cross or star of blades aligned with the handle rather than a single blade angled off the end.
The tool is used by pressing and twisting it vertically into the ground meat (or other products) to break it into smaller pieces while cooking, as well as stirring it to cook it evenly; as it is designed to be pressed and twisted in this way, it flexes and bends less than a nylon spatula may when used in the same manner.
Representative image from Amazon (no affiliation):
