does your friend do any other sport except the gym stuff? becauise its quite normal that you don't lose weight right away if didn't do any sports before. your body is adapting to the new activity by building up muscles, even if you're only trying to burn fat (small weights, many repetitions), which is probably happening as well. once this muscle build up is done you will lose weight, if you train for more then 1 hour (approx.) because during the first hour (or so) energy is drawn from other resources (e.g. carbohydrates from the liver). when i started doing sport again (after a 3 year break) I didn't lose a gram at first. it started after about 6 weeks.