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.
Start in a split stance position with your hands on your hips, your torso upright, and your knees about bent at a 90-degree angle. Push your chest out and lower your rear knee toward the ground in a lunge while keeping your front shin as vertical as possible. Push explosively off the ground, jumping and switching the position of your legs while in mid-air, landing into the lunge position with the opposite leg forward. Repeat, switching legs on each jump.