var bdv_ref_pid=229404;var bdv_ref_type='i';var bdv_ref_option='p';var bdv_ref_eb='0';var bdv_ref_gif_id='ref_180x60_blue_pbl';var bdv_ref_width=180;var bdv_ref_height=60; affiliate program I want to know how long my daughter really needs to do on the treadmill. She keeps arguing about it. So I need to know how long she should do it for.