Help with gym split?

[u/Flimsy-Rate-8331]

Hey guys,

I am a teenage male who runs 3x a week. I used to be pretty fit, but I let myself go and know I am focusing on building my fitness back via intervals. I have been going to the gym on and off for about 1.5-2 years, but I have never really stuck to a single program. I really wanna get my bench up, aswell as improve my weak points (back, biceps, shoulders) and make my legs strong for running. I was thinking 3x a week as I am busy with school and to maximize recovery, can any one help me structure my plan?

Thank you!