Exercise Demo: Cable Concentration CurlPosted January 3rd, 2013 by Admin .Alternative Exercises Dumbbell Concentration Curl2 Comments elliehamfam says: January 6, 2019 at 12:39 pmAs you do each set, is it both left and right side 10-12 each. Then rest is one rep? Or all left side reps and rest, then right side all reps and rest? Log in to reply Nicole says: January 6, 2019 at 5:20 pmDo all right then all left, then rest. Repeat. Log in to replyLeave a Reply Click here to cancel reply.You must be logged in to post a comment.