Forearms perpendicular. You don’t want your rotator cuff involved in benching.
He also doesn’t arch much at all. If you want to get the largest amount of muscle mass involved in the lift, you gotta arch more than that.
IMO you use less of your muscle mass in an arched press because you shift weight off the pecs to other muscles due to not having to bring your elbows down as far. The whole point is to cut ROM.[/quote]
Hmmm… maybe you’re right. But then, if your using less muscle over a 2 inch shorter ROM, there probably wouldn’t be a benefit at all. Maybe it’s a little of both?
Anyhow, you can push more weight with a better arch than seen in that vid.