Which of the following fitness tests is NOT typically included in the entrance requirements?

The correct choice is the CrossFit challenges because they are not standard components of the military's entrance fitness requirements. The entrance tests for the Royal Marines typically focus on more conventional exercises that assess strength, endurance, and overall physical fitness.

Press-ups, pull-ups, and the 3-mile run are all fundamental exercises used to evaluate a recruit's physical capability and are specifically tailored to the demands of a Marine's duties. These exercises have standardized scoring and are well-structured to reflect the physical challenges that candidates will face during their training.

While CrossFit incorporates a variety of functional movements and can offer effective training for overall fitness, it does not align with the specific, standardized requirements set forth by the Royal Marines for entrance testing. Thus, including it in the entrance requirements would deviate from established norms and protocols designed to ensure that all candidates are assessed on common physical standards.