Strength and Conditioning

25

Dentists hate it when you don't floss. Bartenders wince when you stumble out the door. Lawyers shake their heads when you represent yourself. After all, they know how bad the outcomes can be. 

So what makes a fitness pro grimace? For starters:

1. When you "butcher" a great exercise by using poor form .
2. When you use an exercise that puts you at unnecessary risk for injury.

We polled several top Men's Health advisers and asked them for specifics. The result: The top 5 exercises that make trainers cringe.