This is usually caused by certain secondary symptoms such as the softening of the connective tissue during pregnancy. By Whole Body Vibration training, the hormonal balance will be regained quickly, causing the connective tissue to recover their original strength and rigidity. The fact that training on the HyperGravity Fit-N-Flex Whole Body Vibration (WBV) Machines is done in a closed chain position and does not put any additional strain on the locomotive system and joints means that it is an excellent way to strengthen this particular part of the body, and to counteract the instability.