your weight is 80 ....I think over weight reduce that....change your posture when you do work ,don't strain prolonged time. dont lift any weight....icing will reduce the pain..don't drive two wheeler too much...
As you said "Thigh and calf muscles" It must be back or outer Thigh.
Pinching and hitting are the signs of impinged nerve.
Consult with an ortho doctor for your lower back
Before that you should give enough rest and icing on your lower back.
My father suffering from calf muscle pain
started having pain at night and could not sleep the whole nigh
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