Why should full sit-ups be avoided in muscular endurance tests?

Full sit-ups should be avoided in muscular endurance tests primarily because they can cause stress to the low back. This exercise involves a significant amount of flexion and extension through the spine, which can place excessive strain on the lumbar region, particularly if the individual does not have adequate core strength or if they use improper form. The potential for lower back injury increases when the movement is performed repetitively, especially under fatigue during testing conditions.

Maintaining proper form during full sit-ups can be difficult, and many individuals may compensate by using momentum or straining through the back rather than effectively engaging the abdominal muscles. Consequently, this increases the risk of lower back pain or injury, making the full sit-up a less desirable choice for assessing muscular endurance. Instead, safer alternatives that focus on core stability and minimize spinal strain may be preferred.