I havent had any prevous striking experience. i train in bjj and japanese jutitsu. But i plan to start some boxing soon. i watched a few tutorials on the net and leart the basic punches and started practicing them and then eventually started pracicing with wights in my hands. i usually do it with 1-3kgs weights anything above that seems to cause to much strain when I do it too many times. But the question im askin is, is it benificial to do this. I have a bag at home and have noticed some improvement in power and speed. however is it safe? Im not much of an expert when it comes to knowing about mucles in the body and how they react to certain excersises. Can any one help?