The greatest strength improvements in resistance training occur

in 6-8 weeks
3-4 weeks
immediately

The greatest improvement in the strength improvements in resistance training occurs in between six to eight weeks. It is also called as weight training and involves an increase in the size of muscles. adaptations in the bone tissues, body composition adaptations, heart rate adaptations, as well as glucose metabolism adaptations. 

Answeri read somewhere it was the umbilical cord; or placenta; plz check first; good luck