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.
Build stretching into your regular schedule both before and after your daily run -- it's best to do your pre-run stretching after a gentle warmup run of five or ten minutes, since warm muscles stretch more easily. For a model stretching program, try out the 12 stretches recommended below. If you must abbreviate the routine, at least do the three types of wall pushup, the hamstring stretch, the heel-to-buttock stretch, and the groin stretch. Repeat each stretch two or three times: