Practice running through the finish line rather than slowing as you approach it. In races, it s better to make the mistake of starting off too slowly and kicking it in with energy to spare than sprinting from the gun and shuffling into the finish. Energy used to fuel exercise comes from two main sources. The greater the intensity of your activity, the greater proportion of glycogen you use to fuel it. Fat is stored away from the muscles and takes longer to access, but once your fat stores are tapped, they are an inexhaustible supply of fuel for moderate-level activity.
Flexibility allows joints to move in their intended range of motion.
A flexible muscle is a stronger and faster muscle and one less prone to injury. To maintain flexibility, most experts recommend that you stretch your entire body, as every muscle and joint relies on every other muscle and joint to function properly. A tight right quadriceps may cause your hips to pivot in an attempt to maintain a normal stride, and the inflexibility may pull your patella tendon beyond normal limits to compensate. Hang loose anytime. Keeping yourself flexible by stretching periodically throughout the day, such as while at work or in front of the TV, will make all your runs smoother.