That was pretty bad. Having an arch is good, lifting your ass up is bad. Do yourself a favor and watch this video:
[ame="http://www.youtube.com/watch?v=Dh3t6T-nqP0"]YouTube- Dave Tate's Six-Week Bench Press Cure[/ame]
Bench presses should involve the ass and upper back on the bench as mentioned by previous posters.
Tuck your triceps to involve more of them. Proper back extension and butt placement comes from the placement of the feet. Place the feet back towards the torso, but allow them to stay flat on the floor. Next, drive the feet into the floor during the bottom of the concentric contraction and simultaneously push up from the chest and drive yourself into the mat.
This will increase your bench press significantly when you first try it.
Former Marine, UT-BSN, NSCA-CPT, NASM-CPT, CSCS
Current lifts: Squat: 545 | Deadlift: 600 | Bench: 425 | P. Clean: 325 | Press: 285
Thanks for the advice, i will definitely think about all of this and focus a bit more on form throughout the next few months... Just to clarify, this is the most ive ever done on bench and this was the first time to ever try 3 plates so i was definitely pushing with everything i had to get it up. I guess the increase in weight and trying to max out i let my form kind of cheat a bit for me. Regardless though, i couldnt do this a week ago even if i used my legs and butt twice as much as i do here.
Do yall think my elbow placement is correct, or should it come more inside towards my torso? Also, i dont think my arch has eliminated much of the distance as showed in Dave Tate's video does it? I think i may need more arch, and keep that arch rather than lifting my butt off, correct?
Take a rope and tie one end to a 5 lb plate. Hang the rope so that the end with the weight is dangling off the side of the bench but not on the floor and use your butt to keep the rope on the bench. If you start to lift your butt off the bench then the weight will drop to the floor. This should help you remember to keep your butt down as you will feel the rope start to slide if you start lifting your butt up.
Sorry, but if your butt isn't on the bench the entire press then it doesn't count. Lower the weight and do it with proper form, even if you have to take 50 lbs off. Letting your ego get in the way will get you hurt.
You could probably stand to tuck the elbows a bit more. I think the more important thing for you right now is to worry about keeping your butt on the bench and your upper back tight.