If you're doing weight training -- either with light weights or heavy ones -- form is incredibly important. But, according to Well and Good NYC, the tightness of your grip has an impact as well.
Photo by Seth Werkheiser.
If you tend to hold onto weights as tightly as you can, you might want to loosen up. As Well and Good points out, when you grip the weight tightly, you're distributing the weight to your wrist, not your bicep. If you see the tendons in your forearm, you might need to relax your grip. Of course, it all depends on exactly what type of exercises you're doing, but it's a good reminder that form is always important.