Legs are your foundation. They are the biggest muscles in the body and without strong legs you will struggle to make strength progressions in other lifts.
There seems to be some strange idea that leg training is something that should be avoided in order to grow stronger in the upper body. Understandably, the chest and shoulders do look pretty nice when trained properly
but strong legs are the base of your success in the gym.
I am seeing a shift in the fitness industry towards more leg training – especially when it comes to squats and deadlifts because powerlifting has become much more popular. With that said i am more concerned with the average lifter.
The average lifter starts a program hitting the chest, back, arms and shoulders but seems to avoid the legs. Some may train legs 1x/week, but when you look at the muscle mass of the legs you must understand that in order to see growth and strength increases you should be hitting them 2x/week.
Here is a Proper way to train legs. This is my day one Legs Workout.
I train my legs every 4 days.