I'm 16 years old, 162cm tall (5'2) and weight around 73kg (161lb)
I usually have around 1,200 calories daily, and go to gym Monday through to Thursday. Tuesdays I do a Sh'Bam class on top of my normal routine, and a Step Class on Thursdays.
I do a lot of walking and bicycle riding weekly, and have begun to try running but only able to do 1km so far (but 10 minutes nonstop if on treadmill).
How much more exercise should I be aiming to do in order to lose weight? Why haven't I been losing weight?