Joggers get foot injuries mainly ...unequal leg length, weak feet, and improper 15 percent of training. About all runners have unequal leg length In such runners, the ankle and foot often rotate abnormally .....muscle strain on the foot. Next, surveys indicate that 35 to 65 percent of all runners have weak feet....... the feet are weak, ........the force of the feet hitting the ground .........abnormal strain on the muscles of the foot. ........a jogger's foot hits the ground about 1,000 times during every ten-minute mile, the result for a weak-footed jogger is muscular or skeletal damage to the feet. Finally, improper training often ........major foot problems. For example, sudden changes in the duration or frequency of runs place added stress on the feet. Similarly, changing from running on dirt to running on pavement greatly increases muscular strain inside the feet; ........,well-made running shoes should be feet, bought to cushion the feet and reduce strain on them.