By applying the principles and methods of mechanics to the MuSculoskel
etal system, new insights can be discovered about control of human lim
b dynamics both in adults and infants. Here, we first provide a basic
primer about biomechanics-its historical context, terminology, and ana
lytical techniques. Next we review research with animals and human adu
lts that illustrates how limb dynamics provides a window for examining
the physical mechanisms underlying neuromotor control. Finally, we el
aborate on how our research group has adapted dynamics techniques to i
nvestigate how infants gain control of their limbs and learn to reach
in the first year of life.