Strength and conditioning goes hand in hand. Muscle without muscle endurance does not translate into much. Conditioning work can be grueling yet fun at the same time. If you decide to indulge in only one form of masochism, doing conditioning work should be it.
I for one am worried about my muscle endurance. Yes I am getting stronger, but is my strength akin to a spark.. It burns brightly and brilliantly for a few seconds and then it fizzles out or is more like a burning candle... Burning steadily for hours.
Looking at things now, I am more of the former than the latter. But I am slowly trying to improve things. I do my kettlebell swings on upper body day. But upper body days come once or twice a week and I should do conditioning a bit more frequently.
So I'm looking at swinging on lower body days as well. Just to up the ante a bit. Once it gets to easy than perhaps I'll incorporate some snatches as finishers.
P.s. I do 3 sets of 30 swings as finishers on upper body days.