aptitude may be of many kinds for example mental and physical.for physical aptitude there are a lot of books available in market on different topics of aptitude.you can approve your physical fitness by reading books on exercise of your whole body and body parts.books on games could be very useful.read books of different people searching on human physic and its aptitude.for mental aptitude books can be helpful gaining your knowledge on different topics.read books on current affairs but first you should know what are your interests then read on your favourite topics
