You grow while you rest.
A buddy of mine is all about changing his routine
Week 1 : 7 days (2 legs days in a row, 1 day chest + back, 1 day abs + cardio, 1 day full body, 1 day cardio and 1 day arms + shoulders)
Week 2 : 5 days (1 day rest, 1 day cardio, 2 days full body, 1 legs day, 1 day...