Aerobic exercise category includes swimming, running, brisk walking, and cross-country skiing. Aerobic exercise is also known as cardio exercise. It is type of exercise that stimulates the heart rate and breathing rate, and also the amount of oxygen, because oxygen is heavily involved in the cellular reactions that provide the body with the energy necessary to perform activity.
Sounds like the best category to fit these activities in would be Aerobics. Not big muscle-demanding movements, but definitely engage the cardiovascular system.
I feel like some shows romanticize teen pregnancies too much. None of the kids are old enough to be a good parent and in real life the baby will most likely not have a father. Another possibility is them ending up homeless. Shows for not show the seriousness of teen pregnancy.