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.
1 Stretch and take a break. 2  Try exercising at a school track, a local park, or even your neighborhood. 3  Mix it up to keep it new and stimulating. 4  When you are running, and your tired but want to get somewhere, stare at an object close to where you want to go and keep staring at it while running.