Too much back arch while doin shoulders

[Miles Davis]

I'm having a problem while doing my shoulder workout. As I am doing overhead dumbell or barbell presses while sitting on the bench (perpendicular to seat), my back starts to arch badly. I am using my feet to push back against the bench, but that only prevents my back from arching so much. Also, I don't think it is an issue of too much weight; my shoulders can handle the weight. It is only after a certain amount of reps that my back arches more and more, even if I'm doing light weight.

Any advice on how to fix this would be appreciated.

[Miles Davis]

bump.

anyone?

[Flyguy3663]

do it on an incline/decline bench with it inclined close to 150-180 degrees so your back is totally stabilized.

btw try using dumbells as opposed to barbels and maybe go a little lighter and see if the same problem occurs.