Why are so many NFL players dropping like flies with injury

[Underdog5229]

Is this due to shitty strength and conditioning? Seems like 4 to 5 player on each team get knocked out of game . they got fuking back ups to the back ups playing.

[seaborneq]

Looks like lack of conditioning. Once the hits start coming the players leave the field or start getting up slowly. Eventually, they leave the field for good.

[Underdog5229]

seems like 1 good hit and they get up and wobble around concussed, or just plain lay on the field til a trainer comes out and escorts em off the field to not return.