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 If you run outdoors, you can do your warm up (walking, easy running) for the first 5 minutes in your new shoes, then switch to your old shoes and finish the run. 2  Repeat this twice during the week with time and be mindful of any calf, Achilles, or foot tightness or pain you feel along the way. Start slowly (really slowly). 2  If you run on a treadmill, do your workout and finish the final 5 minutes in the new shoes. 3  If you run outdoors, you can do your warm up (walking, easy running) for the first 5 minutes in your new shoes, then switch to your old shoes and finish the run.