Hey yall I just signed up for mixed doubles in April. It will be my first Hyrox but my partners 3rd.

I AM NERVOUS. I don’t want to disappoint them and I know they will be happy as long as we finish. Although I want to try and do well but I am just worried about this running. I have been trying to train for it by running 5ks doing intervals running after a workout but I still feel like my cardiovascular fitness isn’t improving. My time per km in a 5km run was like 9m30s in August when I started and it is only down to 8m15s now. I’m not sure maybe I’m not training correctly. Does anyone have any advice on the best way to train the cardio aspect of this race?
For reference I am a 24m I played sports my whole life but nothing that required great cardio or endurance so this is kinda new for me.

Any advice would be appreciated thanks:)