I don't have a back rest so I have no option but to sit bolt upright. I suppose this means I use less weight but because form is strict due to using my back and stomache etc. I still get the same effect on the muscles.
If I had a back rest I think I'd use 90deg because the weight would then be directly above the shoulders, leaning back slightly might act like a steep incline bench press. I could be wrong, just my thoughts.


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