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.
Runners tend to get tight hamstrings, hip flexors (the muscle just under hips) and calves. Flexibility and stretching is important to prevent injury while running, and to increase your strength and the length of each stride by promoting longer, leaner muscles. Hold each stretch for about 20 to 30 seconds and repeat. To increase your running strength you need to be able to push past your current threshold.