Hello there im new to this forum and i would like some tips im a 170cm 64kg Female im tall and slim and when i starte exercising my weight was only 58 because i was only on the treadmill all the time but now i use the stairmaster and 1kilo and a half weights for toning my arm and my weight is 64 now is this normal or do i need to lose weight? because i want to build up muscle and make my armed toned and butt rouner any tips please? also my weight stopped decreasing when i started lifting weights