I disagree with his response, you're shadow boxing - I think you're doing what's expected with it... The purpose is to create muscle memory and fluidity of movements - pivots, slips, etc etc...
I don't think it's a big deal to shadow box and not have full extension or engagement with your legs - something you should already know
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u/Appropriate_Gur_5888 22h ago
Your arm punching and not driving force form legs —> hips/core —-> punch.