I am not able to run or jump.  Whenever i run or jump i am falling down.  I mean i will not be able to come to the standing position after jumping.  I was quite alright till my 12th standard and was playing all the games and participated in running competition too.  Suddenly during my college days i got this problem which is still continuing even now after 35 years. Kindly suggest some way out to get rid of this.