"peak condition" is a common and correct term that can be used in written English.
An example sentence would be: "The athlete worked hard to get his body into peak condition for the upcoming competition."
Buying cheese in peak condition can be a challenge.
From 7.30am to 4.30pm, she concentrated on reaching peak condition.
Now everyone is in peak condition and it shows.
Physically and artistically, she is in peak condition.
In contrast, the people who go to amusement parks are not necessarily in peak condition.
"The timing is not great but I'm confident that I will come back in peak condition.
"You have to be in peak condition for these workouts," the associate said.
While Ms. Murphy returned to the show on Thursday, she was not in peak condition.
I have a demanding job, and I can't perform in peak condition when I'm exhausted.
Getting all three poodle varieties — standard, miniature and toy — in peak condition requires hours of preparation.
The idea is to ensure they hit the tournament hard with their bodies in peak condition.
