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.
How to: Sit on the floor with knees bent so that your right shin is positioned in front of you, your left shin behind you and your left hip dropped all of the way to the floor (a). Inhale and press your left hip forward until you feel a stretch in the front of your hip (b). Exhale and press left hip back to the floor. Thatâs one rep (c). Complete six to eight reps, working each time to increase your range of motion. Repeat on the opposite side.