Military press a heavy kettlebell. Do a tactical pullup with it. Then a pistol. All super strictly. With a 24kg kettlebell for the ladies and 48kg for the gentlemen.
Many strong people are able to complete one of the events. Some can do two. But the ability to do all three is rare, as the three lifts favor different body types. A man or woman who has completed the challenge is one dangerous individual.
The “Simple” standard from Pavel’s definitive kettlebell text is a worthy yet realistic accomplishment for many ladies and gents with grit and patience.
“Sinister,” on the other hand is rare air. Few will be able to exercise bragging rights to it.