Singh is 1.72 m (5 ft 8 in) tall and weighs 52 kg (115 lb). He attributes his physical fitness and longevity to abstaining from smoking and alcohol and to following a simple vegetarian diet. He has been quoted as saying "I am very careful about different foods. My diet is simple phulka, dal, green vegetables, yogurt and milk. I do not touch parathas, pakoras, rice or any other fried food. I take lots of water and tea with ginger. ... I go to bed early taking the name of my "Rabba" (God) as I don’t want all those negative thoughts crossing my mind."