It may matter if one does mostly isolation exercises or does a lot of compounds because obviously there's overlap with compounds. Back is biceps, chest is triceps and delts so with compounds it's not really one body part per day nor are body parts only trained once week. I realize I'm saying very obvious things, but still. I feel once a week for any part is enough, I question if more frequent ever really gives more results. Many disagree. But I'm the guy telling others lifting twice a week may be "enough" but most don't see it that way. Three minimum and 4 if in any way serious about getting real results. I never
really grew one way or the other but I was
my biggest and strongest lifting once a week and doing 1-3 exercises, sometimes my whole workout was a dozen reps total including warmups

Last year I was trying Basile's idea of keeping a body part sore most of the time. Only arms though, did them about 3 times a week for maybe 4-5 months I forget. Didn't budge my top measurements, still puny. To grow do more drugs and eat more
