A “Cardio Warm Up” is different than a “Warm Up Set“.
A cardio warm-up is done before a training session with the goal of increasing the heart rate and preparing the cardiovascular system for exercise.
Usually, this is the first thing you should do when you land into the Gym. I recommend choosing one of the following 3 options.

Start off slowly and begin to raise your heart rate using one of these machines.
A cardio warm-up is crucial for reducing the risk of injury mid-session and will allow you to push harder in each working set.
A good cardio warm up is the best pre-workout energy shot you can take!
Let me know if you have any questions!