The phrase "a trainer in a" is correct and usable in written English.
It can be used when referring to someone who provides training in a specific context or field.
Example: "She is a trainer in a corporate setting, specializing in leadership development."
Alternatives: "an instructor in a" or "a coach in a".
Lift weights, work with a trainer in a gym, and muscles will grow larger and stronger.
A trainer in a scavenged uniform yells out, "Present, arms!" but there are no arms to present.
Jan Mezlik, 29, moved here from the Czech Republic in late April for a job as a trainer in a physical therapy studio called Stretch.
These men are, for the record, Miller (Mr. Cunningham), a gay public relations person; Hoagie (Mr. Gibby), a trainer in a gym, and Wags (Mr. Hamilton), a lawyer.
In the waiting room the day the vet told us to euthanize Buster, I saw an ad for a trainer in a local pet newsletter.
"Every heroine we talk to, whether a cosmonaut or a trainer in a women's football team in Moscow, is very eager to speak about the discrimination she has met on her way," says Olga Strakhovskaya.
Part of the accompanying video, titled "Hollywood Animal Trainer Viciously Whips Young Tiger" (Hackenberger trained the tiger used in Life of Pi) shows a tiger on a leash with a trainer in an arena.
In her workouts for "Prometheus," with a trainer in London, Rapace tried to cultivate an explosive power.
Garcia sustained a bulging disk in his back while working out with a trainer in Los Angeles a week before the start of training camp.
Similar problems ended a brief spell as a trainer in Belgium, where unpaid debts led to his being warned off.
His mother, Jo, was a jockey and a trainer in England and once took care of the 1951 Grand National winner, Nickel Coin.
