Shahid welcome man 😎 sub-4 marathon target! btw, I like that you wanna mentor newer runners here,,,, you clearly know your stuff. I think we've got 3 types of people in this community: 1. the experienced runners, who can share real knowledge 2. the re/runners, those who coming back, 3. the beginners, who don't even know where to start. so to everyone reading this, if you're new or coming back, don't be shy, ask Shahid (or anyone) anything here.,,,, no question is too basic. that's literally what this place is for.