A Running Chair for Diego

Hi ,
   My name is Diego Muñoz . I am 15 years old , and I have a certain condition called Cerebral Palsy . This obligates me to have to be in a wheelchair all the time .I need assistance for basically everything . However 5 years ago , my parents got me a bicycle specially made for my conditions . This changed my life completely  . Ever since I have had it my father has taken me out on it a lot to the park . Whenever he would participate in marathons he would take me with him and he would push my bicycle while he would be running . For this reason , my parents would like to purchasea specialized running chair for me .