Preg­nan­cy fol­lows a path. Along the way there are some things you can con­trol and some you can’t. One of the most impor­tant things you can con­trol is your phys­i­cal activ­i­ty. It is part of your behav­ior; ben­e­fits are relat­ed to your exer­cise before and dur­ing your preg­nan­cy.