As someone interested in running technique, when I see people running, I can't help myself from checking out their technique. Because of this, I often find myself facing the dilemma of whether or not to speak up when I see someone who's an injury waiting to happen.
Here are two types of runners, I see almost daily.
The Clueless Person in Vibrams -I see a lot of people running in Vibrams. Unfortunately the vast majority of them are heel striking. Also, many of them are such pronounced heel strikers that just watching them makes my knees hurt.
The Shuffler - I commonly see people "running" by swinging their legs like pendulums, only bending their knees just enough to prevent their feet from scraping the ground. They end up landing straight legged, and way out in front of their center of gravity.
Okay, should I say something or just let it go? I've always thought, based on my experiences, that most people would either shrug off my advice, and might even be offended by my critique. However, I can't help but feel a little guilty when I don't say anything. Most of these people will either end up with a running injury, and/or have to give running due to pain.
I'd like to hear the opinions of others. Should I speak up? Would people generally be open to my advice, or would they be put off by it? Is it likely to make a difference, or would it just end up making me "that guy"?