During the upward movement phase of the step-up exercise, which of the following is an appropriate recommendation to make regarding proper technique?
a. lean the torso backward
b. place only the lead foot's toes on the box
c. drive off the floor with the trailing foot
d. push down on the top of the box with the leading foot
e. focus the eyes on the floor
Answer: d. push down on the top of the box with the leading foot