That looks like an amazing ab workout! Thanks for sharing
Not for the faint hearted. Slowly work up to this exercise. It’s an advanced variation
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Can I start by just not using weights?
If you have a strong posterior chain and particularly lower back, yes—go for it
How would I know if I do or don’t?
If you don’t know, assume you don’t have a strong posterior chain. If you want more info, shoot me a DM
Dmed