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.
Hold each stretch for at least 10 seconds. To improve flexibility, make sure that you are performing stretches correctly and that you are stretching the muscles that are your point of focus. Ensure that you stretch both sides of your body. 1  Hamstring Stretch-Sit on the floor with your back straight. 2  Extend one leg forward while the other leg is bent, so that your foot touches your thigh. 3  Reach forward, lengthening your back, to touch the toe of your extended foot. 4  Hold for 10 seconds and then release.