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.
Lying Hamstring Stretch. 1  Lie flat on your back, legs together and straight up in the air. 2  Loop a band around one foot. 3  Pull the leg in toward your face, feeling the stretch in the back of the leg. 4  Bring leg back to start. Stretch the leg out away from your body, opening up the hips. Let leg fall as close to the ground as possible while still controlling it with the band. Bring leg back to start.