Astasia-abasia refers to the inability to either stand or walk in a normal manner. Astasia refers to the inability to stand upright unassisted. Abasia refers to lack of motor coordination in walking. The term abasia literally means that the base of gait (the lateral distance between the two feet) is inconstant or unmeasurable. When seen in conversion disorder, the gait is bizarre and is not suggestive of a specific organic lesion: often the patient sways wildly and nearly falls, recovering at the last moment. An acquired total inability to stand and walk can be seen in organic neurological diseases, including stroke, Parkinsons disease, damage to the cerebellum, Guillain–Barré syndrome, normal pressure hydrocephalus and many others. In normal pressure hydrocephalus, for example, when the condition remains untreated, the patients gait becomes shortened, with frequent shuffling and falls; eventually standing, sitting, and even rolling over in bed become impossible. This advanced state is referred to as "hydrocephalic astasia-abasia". Phobias
Astasia and/or abasia are  associated with the corresponding fears of walking and/or standing, variously called stasophobia, basophobia, stasiphobia, basiphobia, stasobasophobia, stasibasiphobia, etc., sometimes turning into pathological forms, i.e., phobias. See also
Blocqs disease, an illness named after Paul Oscar Blocq

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Mechanical hemolytic anemia is a form of hemolytic anemia due to mechanically induced damage to red blood cells. Red blood cells, while flexible, may in some circumstances succumb to physical shear and compression. This may result in hemoglobinuria. The damage is induced through repetitive mechanical motions such as prolonged marching (march hemoglobinuria) and marathon running. Mechanical damage can also be induced through the chronic condition microangiopathic hemolytic anemia or due to prosthetic heart valves. Cause
Repetitive impacts to the body may cause mechanical trauma and bursting (hemolysis) of red blood cells. This has been documented to have occurred in the feet during running  and hands from Conga or Candombe drumming. Defects in red blood cell membrane proteins have been identified in some of these patients. Free haemoglobin is released from lysed red blood cells and filtered into the urine. Hemolytic phenomena
March haemoglobinuria
March hemoglobinuria, occurs when hemoglobin is seen in the urine after repetitive impacts on the body, particularly affecting the feet. The word "march" is in reference to the condition arising in soldiers who have been marching for long periods; the condition was first documented in 1881. Runner’s macrocytosis
Runners macrocytosis is a phenomenon of increased red blood cell size as a compensatory mechanism for increased red blood cell turnover. The impact forces from running can lead to red blood cell hemolysis and accelerate red blood cell production. This can shift the ratio of red blood cells towards younger, larger cells.