Which of the following is NOT true concerning the curl-up test?
A.
The curl-up only tests the endurance of the abdominal muscles, not their strength.
B.
Curl-ups are performed while lying on the floor with knees slightly bent.
C.
The fingers are supposed to slide 3.5 inches along the floor during a curl-up.
D.
Curl-ups are supposed to be done at a rate of about one every three seconds.