The article has good advice that I would recommend to anyone that trains professionally. I had no idea that the liability insurance for personal trainers was so cheap. That $180 per year premium shocked me. That tells me, as a civil defense attorney, that personal trainers have NOT been sued with any great frequency. Moreover, I would question what that policy (referred to in the article) actually covers. Odds are it would exclude a lot of the things discussed in the article.
All the best,
Lifting heavy stuff is fun and relative......