Can a leg day count as a rest day?

<<Can my leg day count as a rest day for my upper body and vice versa?>>

Yes, but to be honest, unless each upper body workout is particularly light, it sounds like you're overtraining upper body. Overtraining actually works against muscle growth, and can even lead to injury. Your body needs rest to repair and build muscle tissue, and if you're working the same muscle groups every day, they're not able to do that nearly as effectively.

One of the biggest mistakes you see with beginning bodybuilders is that they immediately go all out, thinking that more is always better, and they eventually plateau or injure themselves and burn out. Thankfully, it was a lesson I learned early on, and although it somehow felt "wrong" to reduce the number of exercises/repetitions in my workouts and instead focus on slow movements and proper form, I ultimately saw better results.

Looking at it strictly from a repetitions point of view, you should only be doing somewhere around 60-120 total reps per week per major muscle group (back, chest, legs), and only 30-60 reps per week per minor muscle group (biceps, shoulders, triceps, abs). How you divide that up is really up to you, as long as you give each muscle group at least one day to rest, but one possible scenario would be (pretty close to mine):

Back and leg workout: 2-3 exercises for back and 2-3 for legs. 3 sets of 5-8 reps each. Might throw in a traps isolation exercise (shrugs).

Chest, Biceps, Triceps, Shoulders: 3 exercises for chest, 2 for biceps, and 2 for shoulders (between bench and overhead press, triceps get enough action). 3 sets of 5-8 reps/exercise.

Do chest/biceps/shoulders on Monday and Thursday, back/legs on Tuesday and Saturday. Do core/cardio (if you want) on Sunday, Wednesday, and Friday. This gives every muscle group at least one day to rest, but it gives you something to do every day of the week. It might not seem like a lot, but as long you're using the right amount of weight, going slow, and focusing on form, you will see better results and reduce the risk of injury.

Of course, make sure you're getting enough sleep and calories to maintain such a routine.

Can a leg day count as a rest day?

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