The size of the ball might vary in application; however, training with a middle-enough sized ball allows one to adjust to any range.

No Organization backs me for comment on Internal Arts nor Kung-Fu, but ten pounds is too heavy to start. Volleyball, soccerball, beachball after empty handed practice first. After a year get to that medicine ball mightbe (medicine ball bowling ball is more for eight year ten year or more practitioners with lighter balls after much empty practice).

The resistance helps when youve got flow to envelop the resistance (muscles...). Too much resistance seems as though it would hamper, hinder, interferre not niocely with Flow.

I No_Know

Very some such,perhaps might have been, likely say some, some not.