Pulling of the remainder of the balloon with your hands is often the fastest. And it's remarkably easy and requires little to no strength. The force to do it is in your mind, not your arms. I can't do even one push up, but I'll beat Hulk Hogan any day when tearing balloons apart.
Balloons needed:
Any balloon.
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1 Don't make the mistake of trying to pull apart an uninflated peace. a balloon is at it's weakest on the inflated part (that's why only inflated balloons pop ;-)). Place your fingers on the balloon like shown on the picture and just pull your hands apart. In your mind spread your arms all the way. A video demonstrating it is also available.
▶ video