If you’re aiming for a lengthening of 8cm, it’s advisable to focus solely on extending 8cm on the femurs. Quadrilateral surgery is typically recommended for individuals looking to achieve a total lengthening of 10-14 cm.
For what it’s worth, there was one patient undergoing limb lengthening who underwent an 11cm elongation on the femurs and appeared significantly muscular post-recovery, resembling a professional bodybuilder. Therefore, it can be assumed that you will likely retain the ability to engage in weightlifting activities following the procedure.