i do bis and tris together and it has worked great, heres my split
mon: chest
tues: back
wed: off
thurs: legs
fri: shoulders
sat: bis, tris
sun: off
i do 3 exercises, 4 sets each for my bis and tris, and right now im supersetting them doing one set of the exercise which im doing at that time of each muscle, 20 second break then another set for each, then on to a new exercise for each.
mon: chest
tues: back
wed: off
thurs: legs
fri: shoulders
sat: bis, tris
sun: off
i do 3 exercises, 4 sets each for my bis and tris, and right now im supersetting them doing one set of the exercise which im doing at that time of each muscle, 20 second break then another set for each, then on to a new exercise for each.