Kraus Weber Postural Muscles Test, Part 1
To test the strength of the abdominal muscles plus the hip flexor muscles have your partner lie face up on the floor with their hands clasped behind their head and leg out straight. Hold their feet firmly and have them roll up into a sitting position. If the subject sits up (regardless of struggle) then the test is passed. If not, then this corrective exercise will help.
To further test the abdominals without much assistance from the hip flexors have your subject remain on their back with their knees bent and feet on the floor. Same motion, have them roll up to a sitting position while you firmly hold their feet down. If they are able to sit up then it is a pass. If not, this corrective exercise will help.
Continue with the next test.