I sent this via the Facebook page of Gold's Gym New Manila: Hello, I attended the 8.30am class this morning, 19 May 2014. Although the substitute teacher had excellent vocal projection, his choreography is unsafe and obsolete. I only stayed 15 minutes, but in that quarter of an hour he urged everyone to follow him in a continuous hi-impact routine, reminiscent of the 80s aerobic craze, which has been deemed unsafe by fitness experts. I certainly do hope that future substitute teachers' backgrounds are checked for a safe and productive workout. Thank you, Lorna Lopez