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I watched the video there and then spent the next hour and a half watching other rugby videos. This is a very adrenaline-filled and intense sport to say the least but it looks like a lot of fun.
Football tackling and rugby tackling are not close to the same thing, and neither are an exploitation of anything besides sheer muscle-power.
No, I'm talking about football (American, obviously ) tackling having degraded over the decades with an emphasis on the 'big hit' at the expense of fundamentals. They use their helmet as a weapon, when it was intended for safety, and lead to injuries and actually hurt their ability to tackle. NFL players nowadays lead with the crown of their helmets and shoulderpads just to lay a big hit, failing to execute the tackle properly, resulting in more injuries (especially concussions), and leading to more missed tackles at the same time. But they feel 'safe' doing it because of the gear, even though it is incredibly dangerous to themselves.
Rugby tackling is actually the proper way and the safer way, both. You are supposed to tackle with your face forward to see where you're going, wrap up, and drag to the ground.That's what I mean about exploiting safety gear, turning it into a weapon and feeling invincible. Rugby players don't have either.