Why Bench Press with Arched Back?

Arching while bench-pressing shortens the distance the bar needs to travel, if only by a little, making it easier to move more weight. An arch creates more full-body tension than lying supine on a bench, which better activates your quads, glutes, shoulders, and core muscles — all of which help you move more weight.

Is arching your back bad when benching?

A | It's actually healthier if you maintain a slight arch while bench pressing because your lower back is naturally curved. ... A strategy commonly seen in powerlifting, arching the back beyond its natural curve brings the chest up higher, reducing your range of motion and allowing you to lift heavier.

Should you arch your back when you incline bench?

The incline bench press however, bears no relevance at all and those doing this need to re-evaluate their technique and form. Whilst arching your back can generally allow you to shift more resistance, it also alters the angle of the movement; so much so that it may as well be a flat bench press once again.