Rugby also has the method of tackling baked into the rules. If you tried to tackle in rugby in the same way as a block in NFL you'd immediately be penalised and

Rugby also has the method of tackling baked into the rules. If you tried to tackle in rugby in the same way as a block in NFL you'd immediately be penalised and could see yourself off the field. A typical rugby tackle almost by its definition in the rules will cede a metre or so to the attacking player as they are brought down to set up the ruck. IIRC Pete Carroll of the seahawks has taken advice from rugby professionals to help the d with their method of tackling