Re: doing sit-ups without feet stabilized?
This isn't going to lend itself to high volume which is what you guys usually do for core movements, but flexing your glutes and pushing down on the floor with your feet should help. There is stability in tension. If it helps but you still inch off the floor a bit, you could add keeping a basketball in between your feet and butt. I haven't tried it but it sounds like it could work.
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