Why do you want to change your current routine? What has been your progress on your current routine? Even without this information, your questions can be addressed, though not in full.
-There are some exercises that may be harmful, based on your body type (e.g., behind the neck presses), and virtually all exercises are harmful if incorrect form is employed.
-Keep using compound movements: squat, deadlift, bench, dip, chin, row, overhead press. Changing the order and rep scheme may be effective, which is something I do but on a planned schedule.
-Again, compound exercises are necessary for a solid foundation in strength training, but you can use some isolation exercises, if you so desire.
-A rep range of 8-12 reps is the one most commonly accepted but other ranges are effective too. For instance, the lower body often responds well to protocols that utilize 20 reps.
-I don't understand what you mean by your final question about exhaustion and lactic acid buildup. If you are referring to terminating a set at the point of positive muscular failure, then, yes, that is acceptable.



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