Agreed with Wes. As for belt, if using it, cinch it up! The reason it is there is to provide intra-abdominal pressure. So either wear it right or don't wear it
Using straps really comes down to your goals. If your goal is bodybuilding and hypertrophy; then use straps all you want. Your grip is more likely to fail before a huge muscle group like your back; so use straps to get the most out of your movement. If your goal is strength and powerlifting; skip the straps. It's always best to train the same way you will compete, and there are no straps in powerlifting.
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