You can increase your physical activity while at work by

A) having lunch with coworkers.
B) taking more frequent coffee breaks.
C) hand-delivering a message instead of e-mailing or calling.
D) taking time out for a nap.

Hand-delivering a message instead of e-mailing or calling requires physical movement and can increase your activity level at work. Options A and B involve sitting and socializing, which may not necessarily increase physical activity. Option D, taking a nap, does not involve any physical activity.