Aye. All I know is that since I jave really focused on it I'm throwing farther more easily.
Under- and over-weight training has been proven to work.
Have seen it work in lifting, running/sprinting.
The use of weighted baseballs has been controversial but it works.
I have also tried it in the past for disc golf and it worked for me. Gained about 50' of distance one summer, threw my longest forehand throws ever.