heya m new here,... well i m 19 n have been training with dumbbells for at least 6 months n i have notice when i stretch my hands 90 degress from my body or in other words reach out for something, my lower part of my arm or lower half of my arm is flabby or wobbly....SOmetimes when i shake or push the lower half of my arm , it will start shaking or wobble .m i doing something wrong or wad other steps can be done?.....i notice my upper half is showing improvements but at lower half urrgghh!!!