I want to do more cardio but I don't like running. What do you suggest?
user
I suggest you start walking, to become more fit for walking. Then you can consider running.
assistant
Are there other types of cardio you can do?
user
There is walking, jogging, brisk walking, biking, or swimming.  I can also suggest yoga or other stretching and breathing exercises.
assistant
Oh! Swimming sounds like a good cardio work out. Is there a cardio that's the best for your heart?
user
Swimming is an excellent cardiovascular exercise.  It builds strength, endurance, and is generally good for overall health.  I should say that swimming may be a better workout for some, but that everyone is different.
assistant
I want to do more cardio but I don't like running. What do you suggest?
user
I suggest you start walking, to become more fit for walking. Then you can consider running.
assistant
Are there other types of cardio you can do?
user
There is walking, jogging, brisk walking, biking, or swimming.  I can also suggest yoga or other stretching and breathing exercises.
assistant
Oh! Swimming sounds like a good cardio work out. Is there a cardio that's the best for your heart?
user
That depends on your current health and fitness level, how much time you are willing to spend on a workout, your goals, and also the context in which you want to exercise.
assistant
I want to do more cardio but I don't like running. What do you suggest?