This article is for you if you want to learn how to build enough strength to perform your first pull-up or if you've been doing band-assisted pull-ups with little to no progress in 6 months to a year.
Like most questions, my initial answer is “it depends.” This is no different. My full answer to this question is “it depends, but probably both.”
Sit-ups and crunches often get a lot of hate. When done correctly, there is nothing inherently wrong with either. They just aren't the most effective at, well, anything…
Answers are only as good as the questions you ask.
These three nutritional pillars (plus a bonus!) will help.