100 Double Unders
If you can’t do double unders, do 200 singles as you hang your head in shame, then make sure you push yourself through the rest of the workout.
Just because there are only cardio movements does not mean you just lolly gag your way through it.
Push yourself from start to finish. When you feel tired push harder, keep pushing through the whole workout and finish strong.
If you are a good runner then sprint the runs, likewise if you’re a good rower sprint the rows.
Don’t go through the wod with one speed, slow.