The phrase "a trainer which" is correct and usable in written English.
It can be used when referring to a specific trainer or type of trainer in a descriptive context.
Example: "I need a trainer which specializes in strength training to help me reach my fitness goals."
Alternatives: "a trainer that" or "a trainer who".
Earlier, Vandeweghe repeatedly requested treatment from a trainer, which also interrupted the match.
"A month before the shoot," Faris said, "they got me a gym membership and a trainer, which is standard".
"He picked up one of his shoes, a trainer, which he then threw, which must have been with some force, on to the stage area a few yards away from where the premier was standing".
Last year, a killer whale drowned a trainer, which prompted PETA and Barker to call for SeaWorld's orcas to be retired to sanctuaries.
If it is illegal in your area, use a trainer, which is a butterfly knife with no blade or tip.
That was called a Gatwing Trainer, which was a little fluff thing down here.
He pursued a career as a personal trainer, which led to him to create his own line of exercise equipment, Body by Jake, along with the FiTV network, which he has since sold.
When you chose someone to be your partner, make sure you have a strong bond with each other, rather than hiring a personal trainer which cost thousands of dollars.
Even among Clemens's supporters, his receiving intravenous painkillers and vitamins from a personal trainer — which is against most state laws — leaves lidocaine and B12 as new stars in baseball's darkening sky of drugs.
▪ Selected advanced trainers may go on to pursue additional training in instructional design to become a master trainer, which is the "top" of the trainer pathway.
The B-18s were used as an intermediate trainer, which pilots flew after basic flight training in a Cessna UC-78 and before qualifying in the B-17.
