Define work harder. I think it is worth defining as it is ambiguous and could mean one or more of:

1. Longer hours at work

2. Same hours working but adding time learning

3. Ruthless optimization of time at work.

4. Working smarter (which probably means learning new skills).

5. Doing stuff that makes you uncomfortable. E.g. honest feedback, applying 2 levels above current, hand up to lead messy project etc.