To show you what not to do, each week STACK brings you a moment from the weight room or sports field gone horribly wrong.

Looking for a way to get back at that teammate who keeps pantsing you during your Squats? The Scots have a solution for you.

Equipment

• Bag of cement
• Giant knife
• Your dumbest, most gullible friend (for best results, the friend should have shaggy hair)
• Hose (optional, but necessary if you want the cement to set)

How It Works

Enjoy!

 Read more Fitness Fail Friday:

• The 6 Laziest People Who Have Ever Stepped into a Gym
• The Saddest CrossFit Fail Ever
• The Definitive Guide to the World’s Dumbest Sport