In the following passage some words have been deleted. Fill in the blanks with the help of alternatives given. Select the most appropriate option for each blank.

The importance of physical exercise in (1) ______ the incidence of heart attacks cannot be under estimated. The rise of heart attacks has been attaining (2) ______ proportion in recent times causing grave concern specially to the medical (3) ______. Walking is the best mode of physical exercise which (4) ______ no equipment, money, material or (5) ______ of a club.

Select the most appropriate option to fill in blank number 1.