>>76339822 (OP)
>bag work
>hill sprints
>high bpm liss
>heavy legs and low rest upper body
High bpm liss you can just run for a few weeks and be at a high baseline and not have to do much at all like 1x/wi to get better even. 1x/wk hard cardio is more a thing to somehow add to lifting to be able to drink and eat 3000 calories in an hour and power through the lifting.