When running, most of us concentrate on our feet, breathing, moving forward, or just not slowing down and walking. On your next run, I ask you to consider your hands, since we all carry a lot of unnecessary tension in our forearms. When running, your hands should be relaxed, or rather cupped into a soft (with the emphasis on soft ) fist. When you hold a tight fist, you tense your forearm, and that is wasted energy. I encourage you to not hold anything with your hands when out for a run; this slight imbalance can cause your torso to rotate, and torso alignment is key to good form. This means using an iPod holder or a water bottle belt, or keeping track of public water fountains for on-the-spot sips during your next run.