Which of the following is not an important positive motivating factor for those considering exercise?
a. building strength, endurance, and energy
b. reducing time commitments to family
c. improvement of health and performance
d. reduction of stress and tension

b. reducing time commitments to family

Explanation:

Lets look at the the motivating factor for considering exercises

building strength, endurance, and energy

For ,military personnels, exercise is very important to build endurance, strength, and energy. it helps to be full of stamina to perform rigorous war activities.

improvement of health and performance:A child needs exercise for healthy bones and mental performance at school. it helps the body fights against diseases. When we performer exercise , the heart becomes healthy.

it also helps to reduce stress and tension. Performing exercises will enable one ease off the stress of lives or work

But reducing time commitments to family isn't an important  motivation for considering exercise, because the most important people in our lives are our family and loved ones. You need to be there for them at the time when things are both low and high. Family brings synergy.