the way i set up pretty much guarantees that you won’t lose the arch as long as you don’t relaxe your upper back and let your scaps come apart.
what i do is lay on the bench, set my grip and pull myself under the bar. i then set my feet by spiking my toes into the floor. i then push myself out over my toes thus forcing myself into a tight arch. i do my best each time that i bench to force my feet back further and further to the head end of the bench. this makes me get into a better arch. it’s very uncomfortable and my lower back is screaming afterwards but it definitely makes me tight and my arch stays put.
i’ll insert a vid from this weekends World’s. This is my 475 raw bench attempt. you can see from the vid all the steps i take to setup. i just started doing this setup and it works awesome. i hope as i can get my fet back farther and get a tighter arch that i will be able to make it more and more like a decline thus increasing my bench dramatically. As it was, 475 felt like warmup weight.
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I was taught to do exactly what this guy did, with one addition. After you plant your toes and slide under the bar, try to drive your heels into the floor before the lift-off and get your arch going at the same time. If you can get your heels to the floor, your feet aren’t back far enough. Keep driving your heels throughout the lift.
That said, Drummond’s 475 was an awesome lift. I’m nowhere near that. Not even in the same ballpark. Someday hopefully. But, I was taught by someone pretty good and they taught be to do that with my heels and I’ve been improving dramatically since taking their advice.
Good luck. Hope that helps.
that’s a good addition to what i said. i do that as well but forgot to add it. that’s where the leg drive comes into play.
if you can do all those things, you will be golden on the arch. it should be really really uncomfortable and your low back should be screaming from the super contraction of the arch.