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.
Doorway Chest Stretch. The doorway chest stretch allows you to stretch each side of your chest separately. Stand in an open doorway and place your right hand on the inside door frame with your arm at shoulder level. Hold your right arm straight.Let your left arm relax at your side.ehind Head Chest Stretch. The targets your pec major but also stretches your pec minor and is a simple exercise to expand and stretch your chest. Stand up straight and place your hands on the back of your head. Bend both elbows and open them wide.