It isnt the right answer. No such thing as weak in the knees, muscle keep your legs straight not the joint. Others dont have their calf on the others shoulder but their shin. The girl having her thighs on the 2nd guys shoulder is because she is weak in her core mucles and this way she is basically shortening the leverage(lever) making the plank easier.
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u/TruWaves 13h ago
It isnt the right answer. No such thing as weak in the knees, muscle keep your legs straight not the joint. Others dont have their calf on the others shoulder but their shin. The girl having her thighs on the 2nd guys shoulder is because she is weak in her core mucles and this way she is basically shortening the leverage(lever) making the plank easier.