According to gym lore, you should train at least three times a week if you want to gain muscle or build strength. However, most gym goers commit to four or five workouts per week as they’re following split routines. That’s why that 
Monday is National chest training day all around the world. However, for most people is this optimal? If you’re not a bodybuilder, do you really need to train that often to get results if you just want to drop weight or build overall muscle?
Judging by the non-changing physi-ques of many regular gym goers, it seems like the standard training frequency advice isn’t working and it makes no sense to keep on following the same, unproductive path.