Do flyes have any mass building value?

[Turbo3000]

I might do something like that later this year, but for now, I'm going to see how this split goes:

Mon - Chest/Tris
Tue - Legs
Wed - Back/bis
Thu - Shoulders
Fri - Legs

Sat/Sun - running/stretching/hiking, etc. No lifting. During the week, I might run in the morning, or for a half hour after lifting if I have time.

Nice split. I am about to change things up and I like your setup.

[Scrumhalf]

Yeah, I'm liking this split because it also lines up well with what time I have during the day. Thursdays, I have meetings from 9-noon and 1-5. The 1 hour between noon and 1 is enough to fit a shoulder workout in. Unless you are Bouncer, you've got to work with what you have.. ;)

[Ashop]

I'm generally finishing chest up with 3 sets of flyes but I wonder if I am wasting my time with them. Maybe as pre-exhaustion they are useful, but I wonder if flyes have any value as a basic mass building exercise. Opinions?

YES,,,I think if you do them right they can add some size to your chest.

[Scrumhalf]

YES,,,I think if you do them right they can add some size to your chest.

What do you mean when you say "do them right?" Is there a specific technique that you suggest works better?