Whoa, numbers.
1) It's okay, but bear in mind that working your chest works your back and visa versa. I personally like to separate them.
2) This is really going to be subjective. I like to work out until I am ruined for about a day, but some trainers don't like that. Do you need your arms for your work? Don't kill them.
3) I like to change this every time. Sometimes it's at a 45, sometimes a lot less.
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