I attended a demo at my work put on by a local kettlebell gym that included a circuit in which we, the spectators, were encouraged to participate, and most of us did. In the group were a few guys from my office that think they know everything and can outlift anyone (you know, the type of guy that enters the weight room, pulls a few bicep curls, stares at himself flexed in the mirror, then leaves, satisified).
One portion of the circuit was pushups using a bosu ball. The owner's mom was a woman in her 60's and also one of the regulars in the kettlebell gym. I'm doing my part of the circuit and I look up, she's barking at one of the guys *attempting* to do the pushup part. Finally she gets down on it to show him how it's properly done. Dood still couldn't do it. Old woman out-gunned a young buck. That was a great moment in my life.
Incidentally I rocked the bosu ball pushups.