Reciprocal Inhibition by B Pak

Reciprocal Inhibition - this is the idea that by contracting that antagonist to the working muscle, the workout muscle is actually allowed to relax and stretch. The opposable is also true. This may be something you learn to apply in training (MI40X anyone?) or in life when you're framing in the middle of the night. Hamstring cramp? Try contracting your quads to help your hams relax.