Since I'm training to become a future powerlifter/strongman, i want to use wide grip, which I have for a little bit..though I'm not as strong wide grip than i am with a closer grip. the most i've tried to bench was 215 which was with a closer grip. should i train with the wide grip and grow accumstomed to it, or train with what I'm best at and then as the weights get heavier get wider and wider?
Also, I arch my back as much as possible, but keeping my shoulder blades and ass on the bench. I heard that any arching was bad for the lumbar discs...so what do you all think about it?
Also, I arch my back as much as possible, but keeping my shoulder blades and ass on the bench. I heard that any arching was bad for the lumbar discs...so what do you all think about it?

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