Seriously!  Never use that one!  It has a big spike and it will go into you if you lift the weights.

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↓ Transcript
4 Exercises You Should Never Do

this one puts unnatural strain on your knees
*a man is doing leg extensions on a machine*

this one will hurt your shoulders if done incorrectly
*man is doing behind the back overhead pull down*

this one is a whole lot of work if you do it right
*man is doing squats with weights*

don't ever do this one. IT WILL KILL YOU
*man is at a machine and there is a big spike pointing right at his head as he holds the bar*