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This core circuit workout no weights is ideal for beginners. It works your abs, back muscles, oblique muscles, and the glutes. It will also improve your balance because it has unilateral exercises.
I recommend learning the proper form for each exercise before doing the workout. That way you'll get the most out of the workout and avoid injuries.
You can even do this workout in the office during breaks. It's a standing workout that doesn't require any equipment - do it wherever you are.
Enjoy the core circuit workout no weights.