I was always intrigued about this concept, but when I wanted to try it in some specific area, let's say programming in specific language, or writing blog posts,

I was always intrigued about this concept, but when I wanted to try it in some specific area, let's say programming in specific language, or writing blog posts, I couldn't find more specific info how exactly would the training performed. Is there some template, which I can use to design deliberate practice training for X?