don't firm
Negative imperativeconjugation offirm.There are other translations for this conjugation.

firm

Pressing through the feet and inner thighs, raise your buttocks and tailbone up, but don't firm the buttocks, keeping your thighs and feet parallel (under the hips).
Al presionar con los pies y los muslos interiores, levante sus nalgas y coxis sin rigidizar sus nalgas, manteniendo sus pies y muslos paralelos (bajo la cadera).
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