What do you mean, two positives and seven negatives?

This is a traditional martial arts term in China, which is used to describe a special posture.

Two plus seven means that the body is in a posture of two plus seven.

Specifically, "two straight" means that the legs are two straight, that is, the legs are separated and shoulder-width.

"Seven inversions" means that other parts of the body are seven inversions, that is, legs, waist, back, shoulders, elbows, hands and fingers are all bent or twisted in a certain reverse direction.