Best Seated Core Workouts on YouTube
14 Seated Core Workouts That Are Ideal For People With Limited Mobility
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This 10-minute video is great for when you're trying to squeeze in a quick workout. KymNonstop recommends using cans to get the most out of of the core and arm strengthening moves (you can also use light weights if you have them). I've done it with no equipment and I still feel the burn.