noun
best condition; top form
Refers to a person's or thing's peak physical or performance state. Often used in sports, health, or preparation contexts.
選手はみんなベストコンディションで試合に臨んだ。
All the players faced the match in their best condition.
明日の発表のために、今日はベストコンディションに整え
I want to get myself into top form today for tomorrow's presentation.