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.
Here is how you do the standing hamstring stretch: 1  Stand and cross your right foot in front of your left. 2  Slowly lower your forehead to your right knee by bending at the waist. 3  Keep both knees straight.  Hold this position for 15 to 30 1  seconds. Relax.  Repeat for the other side by crossing your left foot in front of your right.