Another factor is the lack of a helmet and padding. Because of this, players are much more careful when tackling. Eg:

* NEVER leading with the head, which is quite common in American Football

* There must be an attempt to wrap your arms around the player. Not doing so is a shoulder charge, and illegal.

* High tackles (above the shoulders) are illegal and can result in yellow or red card depending on severity.

* Spear tackles (picking the player up and driving him into the ground head-first) are grounds for a red card.