I press the muscle on the side of my shin bone and it leaves an indent but eventually retracts. There is no pain. When I noticed it I had started walking about 3 miles and my shins were soar when I was done. When I was walking it would get to the pint where I could barely lift my foot because the muscle was so tight.
Hi, As there is leg pain after walking 3 miles and indentation I feel this is related to the over excitation of the neural fibers leading the muscles to contract. Also, the fatigue is setting in after walking for 3 miles.  So there needs to be a change in the exercise program to improve the muscle strength and improve the endurance. The best way to do this is to learn the maximum ankle toe movements while sitting and lying position.  Also doing straight leg raise to the maximum number of counts should provide a good endurance towards the overall well-being of the muscle. Hope I have answered your query. Let me know if I can assist you further. Jay In Chat Doctor.