Bosu balls work in much the same way but have a flat side that makes stabilizing yourself a bit easier. The problem and danger of training your core with either piece of equipment comes when you overdo it (and most people do). Doing crunches only on a Swiss ball overdevelops some of your core muscles while neglecting others, leading to a slew of imbalances that can cause injury and pain. Training with the compound movements described earlier eliminates this risk, as your entire core is trained evenly. (You also get the added benefit of training your other major muscle groups, making the most of your workout time.)
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