My right calf has developed distinct tendency to cramp during running or at the end of the run. I am a male, 71 years old, 142 pounds, 5 -7 , have worked physically most of adult life. Do strength training on alternate days when not running. Work out five to six days a week. Now, in the last day, realize right calf especially is quite swollen, left calf swollen only a little. Should I try walking more during the day, since I have been doing desk work?