noun
peak condition; best form
Used when an athlete or performer is in top physical or mental shape, often in phrases like 完調にある or 完調に戻る.
彼は今シーズン、完調にある。
He is in peak condition this season.
故障から復帰した選手が完調に戻るまでには時間がかかる。
It takes time for a player returning from injury to get back to their best form.