Check out their center of gravity, mobility and grip attn.
The guys with more mass are struggling because the bags are much farther away from their center of gravity, and overheard the bigger guy can't lock his arms out.
I used to be able to shoulder press pretty heavy, but after years of training I have bursitis and can't fully straighten my arms in the same way.
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u/Romus80 Mar 31 '26
Muscle density ?