Becuase it can let them know what will happen if they do this or that and it will let them know how a baby have birth affects
Answer:
genetic abnormalities ( last choice)
1. The workouts can be increased by a bit each time
2. the principal or specificity states that if one area is trained, that specific area improves. Flexibility is a good example of specifically going for being more flexible
Well one reason I can come up with is that it helps your posture will helping you think better since your spine is connected at the back of your neck.