Sit down more, and loss some weight. Weight gain is natural during pregnancy. However, do not allow the fetus to grow too large inside the womb.
Stiff legs during pregnancy mean the legs are carrying too much weight.
C-section is very rarely performed in all other countries except the United States. Natural birth is natural.
Tell the doctor who recommends giving birth by C-section over natural birth whenever possible to go play golf!
Walking for an hour everyday like my wife and my daughter did when they were pregnant will keep the weight gain down and will facilitate natural birth. Walking exercises can be done up to one week before due date.