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.
To do shoulder stretches, grab the corner of a wall or doorframe with your right hand at shoulder level, your arm extended out. Then twist your upper body slowly to the left. You should feel the stretch in your shoulder. Hold and repeat. Then switch to your left side. A variation of the shoulder stretch is to reach up with your hand and extend your arm back behind your shoulders, as if trying to scratch your upper back. With your other hand, push your elbow back a bit more.