There are many reasons why walking legs become sore and weak, mainly related to excessive exercise, malnutrition, long-term standing, certain diseases, etc..
1. Over-exercise: When lactic acid builds up due to over-exercise, there will be soreness and weakness in the legs.
2. Malnutrition: When you suffer from chronic malnutrition or lack of potassium or calcium, you will experience soreness and tenderness in your legs.
3. Standing for a long time: when standing for a long time, the venous return of the lower limbs is impaired, resulting in blood stagnation in the lower limbs and sore legs.
4. Certain diseases: such as pear-shaped muscle syndrome, lumbar disc herniation or hip joint lesions, will also induce sore legs.
There may be other reasons that lead to walking soreness and tenderness, if there is a long period of soreness and tenderness of the legs can not be relieved, we should consult a specialist in a timely manner.