Watching people move in the sagittal plane gives us an insight into their kinematics, providing information about their loading pattern.
Are they excessively loading the knee? Or alternatively, avoiding loading the knee?
We can pretty easily work out the joint in questions moment arm, and then with consideration of kinetics (force), can start to determine whether we are happy with that joint or body segment taking that amount of load/torque.
Do we need to attempt to alter the movement pattern to redistribute load elsewhere?
Here are some examples of landing mechanics, and then some example exercises to help build that eccentric control which is so vital for landing and shock absorption.