Two runners in Dubai have taken up a 48-hour fitness challenge not only to push their limits but to raise funds for sick children whose families cannot afford their medical treatments. Lebanese expat Dr Haitham Solh and UK national Ahmed Ali started running and jogging for four miles, every four hours for 48 hours since Thursday. The challenge­, which they called 4X4X48, ended Saturday morning and the duo has met their target of raising Dh 5,000.