Mumbai, Jan. 16 -- Family members of visually challenged Amarjeet Singh Chawla, 64, say he has been running a marathon every weekend of the year. He will be running his 125th half-marathon and 200th marathon on Sunday. "I have decided that next year's Mumbai Marathon will be my 151st half marathon. I plan my runs on the basis of that," said Chawla, who was diagnosed with macular degeneration, one of the leading reasons behind vision loss, at the age of 13. He lost his eyesight completely when he was 40. "My escorts act like my eyes... They say that I am a fun company to keep," says Chawla, fondly called 'Sporty Sikh' by his friends....