Is there anyone who has a very good working and practial knowledge on the stability ball??
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I use the ball all the time. I find it useful for people starting out who already have a bit of core strength (so they’re safe on the ball) but who need more compound exercises. While doing a chest fly we can also activate the obliques and glutes! It’s useful when there’s time constraints as well. This way we can touch on several body parts without the focus on individual exercises.