The fact is, you can train biceps or triceps first on arm day, but I much prefer alternating exercises for each.. You never want to work a smaller muscle first that will be assisting a larger muscle afterward, as in doing triceps before chest or shoulders or biceps before back.
So I follow a bunch of bodybuilding/fitness youtube channels and I have noticed that a lot of women do curls before rows. I've been into bbing .
Well, I told a rep at LA Fitness that I had a shoulder day and he said that was one of my. Then I'll have a separate back and biceps day.. back, on separate days after a rest period of about 2 days, during which I'll do legs or jogging.. muscles first so work on your back before shoulders, much like what Ajay Singh said.
I myself love doing biceps on a different day than back, simply because I can focus and work them much better. I do my Back workout Wednesday, and then .
Strengthening your back and biceps on the same day is a good pairing, as the biceps. Do your biceps exercises before your back workout to concentrate on .