Skipping the Cardio cutscene in level 4 saves 30 seconds, but to do it requires beating the section prior, which sets a flag which allows you manually skip the lengthy dialogue . Initially, I thought it required having a pre-made file. However, that didn't work. Which made me realise that the cutscene flag is stored in the games RAM, and not save file. Similar to what the options for text speed and control schemes are for MKR. So prior to any attempt you would need to go into or play up to level 4. Beat the Cardio section and soft reset out.