In a group fitness setting, there is a lot of value in being conservative with exercise selection.
As fitness professionals, and most likely fairly fit individuals ourselves, we can get excited about intensity and push the envelope with exercises selection.
Some people will love that we are conservative, others will love that we are intense.
Ultimately, in a group setting, it is important to offer modifications or variations for ALL exercises, as all exercises have the potential of being contra-indicated for any given individual!
Standing quadricep stretch is contraindicated?
I think until we get fully regulated, licensed, and mandated to follow only certain exercises, it really is up to our profession to always consider the source, pay attention to the people or person you are training and know limitations.
We are not about “one size fits all”, we have to be flexible with our thinking, and sensible with our actions.
Since a multitude of exercise options are available, it is a good idea to weigh the risk-versus-benefit for an exercise and compare it to the needs and goals of one’s client. My policy centers on selecting exercises with an emphasis on reducing risk and maximizing benefit. This works well for the client and insures that I operate within the scope outlined by my certifying agencies.