What do work restrictions indicate?

Work restrictions specifically indicate limitations on duties due to health conditions. This means that an employee may be facing certain physical, emotional, or medical challenges that necessitate modifications to their job responsibilities. For instance, a person recovering from an injury might be restricted from heavy lifting or prolonged periods of standing. These restrictions are put in place to ensure the individual's health and safety while they continue to work, making it crucial for employers to accommodate these needs.

The other options involve different aspects of job requirements and conditions that do not directly relate to health restrictions. While limitations on work hours and mandatory overtime relate to scheduling, and increased job responsibilities pertain to workload, they do not specifically address the health-related limitations that work restrictions are meant to convey. Thus, the focus on health conditions as the basis for work restrictions makes the correct answer clear.