4. Swimming and water aerobics classes
Beginners might want to start with classes since swimming laps can require a higher level of fitness and skill.
There are several water aerobics classes that are considered low-impact, and they are often recommended to people who need to avoid the higher impact activities like jogging and cycling.
Water aerobics classes and river walking are both great ways to get cardiovascular exercise while also adding resistance.
Once your fitness increases, being able to maintain the intensity needed to swim laps for 30+ minutes will be easier to achieve.