Recently I have been noticing that I my back hurts right in the middle the day after I workout my shoulders. I do arch my back somewhat when I do military press and db press but it's not a very intense bend. And reccomendations on how to cure it?

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Deadlift - 405X1
Squat - 325X1
Bench - 225X1

Golf Tee - Anyone who can bench more than they can squat and/or deadlift.