You asked

Are regular gym classes safe while pregnant?

There is nothing wrong with attending gym classes during pregnancy. In fact, physical activity is encouraged in moderation. The important thing is to understand which classes are safe and which should be avoided. Exercise, but do not overdo it. Rest for your body is an even bigger necessity when you are pregnant.
Gym classes will help you to build strength, help you to relax, allow you to practice breathing techniques and to help keep your body healthy for your baby. Exercises that are great during pregnancy include cardio machines like the treadmill and elliptical, yoga, cycling, swimming, and jogging or walking.
While there are plenty of things you can do throughout your pregnancy, there are some exercises to avoid entirely. Do not participate in any activities that require you to lay flat on your back as this decreases blood circulation to you and your baby. Also stay away from heavy lifting and any type of strenuous exercise such as kickboxing or karate. Contact sports are not a great idea either.
The key is to develop an exercise routine that helps you to stay healthy but in no way puts your baby in danger. Pay attention to your body’s signals. If you begin to feel sick or lightheaded – it is time to stop.
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