The specially designed system of exercises for pregnant women aimed at strengthening the back muscles and improve circulation in the legs, since these body parts accounted for the largest load.

Please remove spaces between words.
Thespeciallydesignedsystemofexercisesforpregnantwomenaimedatstrengtheningthebackmusclesandimprovecirculationinthelegs,sincethesebodypartsaccountedforthelargestload.