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Static equlibrium

Q2- as a part of an exercise regime,,a lady lifts herself up from standing position at the rest,wth wait distributed normally across the soles of her feet,onto tiptoe(standing on 2 feet)which muscle group she is exercising ?is it possible to achieve the static equilibrium by loading only one muscle group?if so draw a free body diagram showing the key components that you think might be involved in this process ,showing where forces are generated and reached.for your chosen configuration ,compute the forces in the active muscle as a function of the angle of lift of the foot,theta,and of the fixed lengths of the relevant bones.