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.
Don't waste all your training by overworking yourself in the final week before your half marathon. You can't gain fitness in these last seven days before your 13.1-mile run, but you can tire yourself out so much that a top performance is out of reach.Your workout the week before a half marathon should feature mostly rest, a bit of cross training and some short runs so you feel springy, not slow, on race day.unning. Your long run a week before the race should be no more than 8 or 10 miles. For example, if you are racing on a Sunday, the prior Sunday is the day you do your last long run.