There are many people who want to know if they can do workouts like insanity or CrossFit barefoot. Sure, anything is possible and there are certainly people who do things like run marathons without shoes. And you'll also find people firmly on both sides, including medical and fitness professionals. Some people say that it's healthier because your body is moving in a more natural way. While the other side says that your feet need cushioning and support. We generally fall onto the side of recommending shoes, at least a pair of minimal ones. But the key with using these kinds of shoes (or doing insanity barefoot) is to start slow. Only a few minutes and then see how your feet during the workout, and also the next day. If you've been using shoes your entire life, it can be quite a shock to suddenly just stop using them and it certainly takes some getting used to. Ease into it and pay close attention to any signs of oncoming injury.