50 kettlebell swings. Start with a weight that allows you to do 20 perfect repetitions but nor more than 30. In other words, start with a weight, no less than 20 lbs, that you can "grow into." (In the video below, the "point C" version is the actual kettlebell swing. The "point A" and "point B" versions prepare you to do "point C" with proper form.)
Exercise 3