Why are rear delts difficult to grow?

[Uua]

Is it weight or reps that I need to increase on rear delt flys?

 

[我需要阴部]

It's a small muscle that's hard to isolate you need to have really good form

 

[Mighty_m]

just focus on increasing strength every time you train them, if not that then just over a steady period of time. Strength gains over long period of time indicates muscle growth so just get stronger

 

[User28823]

skill issue innit