Which one of these tips for power walking from the unit is NOT correct: Options:

A. Posture: Stand tall, with your shoulders back.

B. Arms: Keep your arms bent. Pump your arms to help you walk with power.

C. Hands: Make a fist

D. Feet: Land heel first, roll through the foot, and then push off from the ball of your foot.

E. Breathing: Maintain regular and steady breathing.