What are your 500m splits? > One of the best "time savers" for cardio is HIIT, and you just can't do that rowing Of course you can, something is wrong here,

What are your 500m splits? > One of the best "time savers" for cardio is HIIT, and you just can't do that rowing Of course you can, something is wrong here, although it might be difficult to diagnose over the internet. "max hardness" might be a clue - you probably shouldn't be setting the resistance to maximum and maximum resistance does not imply more intense workout.