walking for 40 mins = 150- 200 calories loss

bicycling for 40 mins= 200- 300 caloris loss

so definetly bicycling burns more calories.. but u need to change ur exercise cuz ur body gets used to just one type of exercise and it doesn't do much.. Try to do 45 minutes of cardio  everyday like running, jogging , playing sports , bicycling , power walk etc.. then add 15 mins of muscle tonning..

Try to watch what you eat but dont do fad diet its not healthy... and be patience .. u will look better right way and in right time.. Trust me there are no faster or easy way.. :):)