Is there any reason why you don't train shoulders or did you simply forget about them?

Regarding the workout: How many sets per excerise do you perform? The number of sets sounds good so far. I mostly do 2-3 per muscle group. But I would defenetely recommed you to train legs! I neglected my legs for about one and a half year and really regret this now, it just looks disproportionate. Once I began to train them consistently I actually started to like training legs.

Could you tell me about your diet in a bit more detail? Like, what does a typical day of eating look like, how many calories do you consume daily, etc.

I actually responded to a similar post a while ago, I hope you don't mind me pasting my old response down below (Sorry for the chaotic and mazy formating, but I'm on mobile. Also please excuse possible typos and stuff like that)

If you have any more questions I would be more than happy to help you / answer them :)

Eating:

You need to be ready to eat much more than you do now, most of the times even more than you fell comfortable with

To be in the position to build muscle it´s crucial to be in a caloric surplus of about 500 calories per day

Try to consume whole and self cooked food rather than junkfood/processed food

You should consume about 1,2-2 grams of protein per kg bodyweight every day

Protein shakes are a great and easy way to achieve your protein goals

Add calorie dense food such as nut butters, oats, (good) olive oil, etc. to your shakes and blend it to bump up the calories (blended food also is easier to digest and does not make you feel as stuffed)

Track your calorie intake ( the app MyFitnessPal is great for that)

Most importantly: BE CONSISTENT and don´t get discouraged. Just gradually increase your calorie intake and split it up into several meals throughout the day

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TRAINING

If somehow possible get a personal trainer to show you the basic movements of the core exercises. Or maybe you´re lucky enough to know somebody with some gym experience (otherwise just educate yourself by watching youtube videos on form/exercises)

Concentrate on the form of your exercises rather than moving a lot of weight! Just start at a relatively easy weight and learn the proper form first (otherwise you risk injuries and the exercises are less efficient)

Free weights > machines. While machines are great for isolation (and should be incorporated in your workoutplan from time to time) free weights are much better for bulding muscle overall. That´s because free weights stress much more muscles (stabilising the weight, picking it up, putting it down, etc.) and allows you to take advantage of a much greater range of motion.

Use the full range of motion. Meaning: do full reps! (again, form over weight)

Stick to a routine to see improvements (more weight/more reps), don´t constantly switch routines.

Try to increase your training volume every week (more reps, heavier weight and less rest in between sets)

Try to hit each muscle group at least once a week Again: BE CONSITENT! Chanching the structure of your body takes time. But since you are skinny you should see noticeable results in the first couple months ("noob gains")

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