In science, mechanical energy is the sum of potential energy and kinetic energy. It is the energy associated with the motion and position of an object.The law of conservation of mechanical energy states that in an isolated system that is only subject to conservative forces the mechanical energy is constant.n science, mechanical energy is the sum of potential energy and kinetic energy. It is the energy associated with the motion and position of an object.
As with the standing shin stretch, the cross-over stretch is well-suited for pre- and post-running stretching. You can perform this stretch with or without shoes. Start standing with your feet together. Cross your right leg in front of your left leg and place the tops of your pointed right toes on the ground.
With your right arm, pull upward so that your left arm is stretched. Hold for 20 seconds. Then, allow your left arm to pull on the towel to stretch your right arm. Hold for 20 seconds. Repeat using the opposite arms. Do this exercise only once if you have already done the other two shoulder stretching exercises.