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 prepare for this stretch, start by lying on your stomach with your legs extended straight behind you. Point your toes toward the wall behind you. Bend your elbows so you can bring your hands to the sides of your shoulders, and place your palms flat on the ground with your fingers pointing away from your body. Move into the stretch by slowly extending your arms to push your chest and stomach off the ground while your pelvis and legs stay on the floor.