In one sentence, describe what the following article is about:

Getting together with a small group (2-4 people) can shed new light on your training regimen; new people offer new ways to move, different paths to take, and constructive criticism of your methods. Since you have already developed your own style, the ideas offered by new people can only expand your possibilities. Be sure that ideas are not stifled and no individual person sets the bar of what should work for everyone; this method works best as a creative discovery between friends. On the other hand, if you followed someone else's method from the beginning, you could be stuck with a style that does not actually make sense for you. Remember that while large gatherings have the potential to be an extension of the smaller training and discovery sessions, too often they devolve into a roaming herd that quickly grazes over obstacles while looking for the next big trick. Understanding Parkour through self discovery is the sure way to avoid falling victim to this personal experience, making a traceur and his Parkour unique. This option can be helpful to someone who doesn't know how to condition themselves or prevent injury; however, experimenting by yourself first is highly recommended. By entrusting your early development to a stranger, you run the risk of following a path that is completely wrong for you; a good coach will help you get started and drill you in the essential moves necessary to begin parkour and will also teach you how to stay safe. A good coach will set you down the path of discovery and help you form your own style, while a bad coach will set you down their own path. As Parkour gets more popular, an increasing number of people are trying to cash in as coaches. Be wary of anyone who doesn't offer their services for free, at least part of the time. A coach who is still connected to the community, through free outdoor training sessions , is a good bet.

Summary:
Start to train with other people. Use training as a collaboration. Get a Parkour coach.