Which of the following components is NOT a part of a comprehensive fitness program for Marines?

Flexibility is indeed an essential component of a comprehensive fitness program, and each of the other options—coordination, endurance, and strength—contributes crucially to overall physical fitness.

A comprehensive fitness program for Marines should ideally encompass various aspects such as strength training for muscle development, endurance training for stamina and cardiovascular health, and coordination exercises that improve balance and agility. Flexibility is significant for maintaining a full range of motion and preventing injuries, and it is integrated into training routines to ensure Marines can perform optimally in various physical situations.

The inclusion of coordination as a critical element acknowledges that Marines must be able to execute complex physical tasks that require a combination of skill and body awareness. Conversely, by identifying flexibility as not being part of the program in this context, the answer overlooks its fundamental role in a well-rounded fitness regimen.