wrist/ankle weight a a great way to increase strength and stability, however, i wouldnt throw on an ankle weight and start throwin kicks as fast or hard as you would without them, this could damage your joints. instead, but the weights on and move through the kicks painfully slow. this will increase stability, balance, power, and technique to some degree. but dont forget to go all out without the weights on a heavybag, or just throw some techniques out in the air. if you want resistance for your technique at regular speed, i highly recommend getting resistance bands, where the resistance comes on gradually and is a lot safer for your joints. ive even heard of some people cutting a bicycle tire tube, tying one end to something stable and the other end to the bodypart of the technique u are practicing