Here is how: first they notice feeling uncomfortable in the high stack shoes when they run in them. They also notice they are running slower, even easy pace is slower, its awkward to run. Then they notice a pull in their calf muscle - eventually the muscle tears and they can't run at all. Giving it time to heal and returning to the low stack shoes solves the problem. I've experienced this several times in switching to what is available on the market. If I walked into a store right now, the only shoe that wouldn't guarantee me an injury is the saucony sinister and maybe some spikes. Even the sinister is a bit high so I run slower than in the shoes of yesteryear, it just feels a bit off.