Water running is also a great cardio workout when you're doing water aerobics. You want to make sure that you keep your hands in the water. You want to pump them back and forth. You pick up the pace so water marching you just march, and this one is running in the water. You want to make sure that you pick up your knees. This is called Pick Up Your Knees, or High Knees, some people call it that. You can also kick your butt when you're running. You can also go side to side.
A lot of the time instructors will tell their participants to wear a belt and they can run back and forth the length of the pool. That's a little bit harder, but it's a great cardio workout.
In addition to using the noodle when you're doing water running, you can also use a kick board, if you have a hurt arm. It's better to pump your arms if you can. You can do sides. Make sure you're always breathing when you're doing this. This is a good cardio workout so you're going to get out of breath, so make sure you're breathing from your core. And out. Pick up your knees. You can also water run side and in. There's all different ways you can do this. You can go forward and back, forward and back, or side to side.
Keep your heart rate going. Keep pumping your arms. That is water running.