Body Tip To build a strong back and core, trade in your chair for a stability ball. You’ll earn stronger abs and better overall balance.
Building strong core muscles — those in your lower back, abdomen, hips and pelvis — leads to better balance and stability. Though most physical activities rely on core muscles, it’s an area of fitness that often gets neglected. According to Melissa Hendricks, MEd, manager of the Cleveland Clinic fitness centers, using a stability ball as a chair is a great way to increase core stability during everyday activities. To avoid discomfort and muscle fatigue, she recommends starting with short sessions on the stability ball. Your longest periods should be no more than 30 to 60 minutes, she says. As a general rule, the exercise ball should be large enough that, when you sit on it, your knees bend at a 90-degree angle.
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Youth Voices Magazine 
Great tips 🙂 A stable ball is a great way to build on your abs. Keep up the awesome advice.
Thanks! Will do have a great day:)