I used to think like Willet but recent experience has changed my mind.
I'd started on one of those Russian volume programs and found it strange that flys were always part of the schedule. I decided to do them as written and re-evaluate.
In this particular case, they were always done sandwiched between two compound lifts. So I'd do bench, then fly, always followed by some form of squat or DL. This allowed for a bit of a 'breather' between sets of heavier stress, allowing you to continue lifting- keeping your intensity up. This improves your overall conditioning and work capacity, one of the goals of the program.
I also agree with what timtim wrote about them not being a mimic of a press and so having unique muscle recruitment. Including flys provided a new form of stimulus and led to some good upper body development. Form, of course is important, as is realizing what they're for in your progression of exercises, not just tacking them on as something to do after you bench.
I'd started on one of those Russian volume programs and found it strange that flys were always part of the schedule. I decided to do them as written and re-evaluate.
In this particular case, they were always done sandwiched between two compound lifts. So I'd do bench, then fly, always followed by some form of squat or DL. This allowed for a bit of a 'breather' between sets of heavier stress, allowing you to continue lifting- keeping your intensity up. This improves your overall conditioning and work capacity, one of the goals of the program.
I also agree with what timtim wrote about them not being a mimic of a press and so having unique muscle recruitment. Including flys provided a new form of stimulus and led to some good upper body development. Form, of course is important, as is realizing what they're for in your progression of exercises, not just tacking them on as something to do after you bench.