It depends on when you do legs. I would hit legs on Monday to get them out of the way. Your gonna want to split up your leg and back thickness workout by as much as possible...and yeah I might do this once a month or so if I feel like my width needs more isolation work, but def not something you want to keep up on a weekly basis IMO....Some pros do this, but they have A LOT of other factors involved that increase their muscle recovery time and allow them to train like this.