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(domineaux @ Sep. 05 2007,18:59)</div><div id="QUOTEHEAD">QUOTE</div><div id="QUOTE">You can keep your back very straight in the seated press.
It is common to arch your back doing standing presses.
Arching your back can lead to injury, especially if you haven't been steadily training your lower back.
The straighter you can keep your back in exercises the better you'll do at preventing injury to your back.
I'm particularly sensitive about back injuries, because they can force you to stop all training. It's practically impossible to do workarounds when your back is injured.</div>
"Most people will be able to use more weight seated than standing. Using more weight can lead to more growth stimulation placed on your shoulders. On the downside, the seat decreases the involvement of the core, glutes, and hips.
It's also worth noting that performing the movement seated drastically increases lower back stress by increasing spinal compression. When seated, the lower back is "compressed" directly between the weight and the seat. When you stand, the weight is still there but the downward force is partially "absorbed" by the legs and hips, reducing lower back strain."
- Christian Thibaudeau
I agree with thib , seated = much safer + more "compound" so to speak.