Running

Ok next year I wan to do 5k below 20 min. My plan is to simply start with 1k sub 4 min and then just make extend the distance but by bit until I reach my goal. Does that approach sound good. Will mix it with some different runs and intervals.

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mmm strange approach. it might work for you but I've never heard anyone training like this...
I would suggest doing some reps 3x1000 or 4x1000 at race pace with some static rest in between or 500m jog.

Yeah! That sounds much more efficient😄 will give it a try!