Model the behaviour you want to see. If you send emails at midnight and skip holidays, your team will too regardless of what you say.
Strong answers include: modelling healthy behaviour themselves, monitoring workload distribution, encouraging time off, setting boundaries around after-hours communication, recognising signs of burnout early, and having honest conversations about capacity. Best candidates back their words with specific actions and policies.
Tests values and consistency. Leaders who talk about balance but model overwork are not credible. Ask for specific examples of how they have protected their team from burnout.