A warm-up routine should focus on two things: * O reducing headaches and stomach cramps
O preventing broken bones and tissue loss
O increasing your body temperature, and stretching your muscles
O reducing inflammation and keeping skin pores clear

Well, l think that some effective communication is, emotional barriers and lack of attention, interest distraction or irrelevance. also some physical disabilities such as hearing problems or speech difficulties.      l hope i am correct  and you good luck.