Why do all blacks where tape on there legs?

Answer 1

It you are referring to some of the forwards with tape set above the need on both legs - These are normally the nominated line jumpers. When muscle liniment is rubbed on the legs pre match the legs become very slippery. The lifter s frequently used to slip in the jump and the line out failed. The tape is covering a roll of bandage normally and this adds grip for the lifters to use.