How often should i change my exercise to help me lose weight faster? -

i work out for about 30 to 40 minutes a day,about 6 times a week on an elliptical trainer..im also on a low kilojoule diet..its been 2 weeks and i ve lost 4lbs,but i ve read somewhere thats its usually water retention.So how do i know if my exercise routine is helping me?

I always work out 5 days a week. I do a different body part each day. your body needs at least 36 hours to heal after an intense workout. Your body will adapt to your workout so I would advise changing your routine every 2 or 3 weeks.