Feel the tight, more rigid muscles soften and give less resistance as you encourage this lovely lengthening of the limbs. (babycenter.com)
Raspberry is a tonic plant for the uterus which helps to increase the tone of flaccid muscles in the uterus or relax overly rigid muscles, which ever action the body might need. (mamarosemary.com)
Loss of muscle tone is also a cause for concern, as are rigid muscles. (ourfamilyworld.com)