Quick question, I searched for the answer, but couldn't come up with a definitive one. If this has been posted before, my bad. But anyways... What would be a good weight to start out for a punching bag? And what type. I am not too sure what the purpose of different types are. I.E. The kind tethered to the roof, and the kind tethered to the roof and the floor. I was thinking maybe a 60lb one tethered to both roof and floor? I have taken ~1.5 years of kempo awhile back, now I am getting back into martial arts. I am 5' 8" 135lbs if that helps out.