in harness
US /ɪn ˈhɑːrnɪs/
UK /ɪn ˈhɑːrnɪs/
1.
working or performing one's duties, especially after a period of rest or inactivity
:
•
After a long vacation, it's good to be back in harness.
•
The old politician was still in harness, actively participating in debates.