I've started cycling rest periods just like cycling different reps and sets. I used to take 2 to 3 minutes no matter what I was doing. After years of that I noticed I was really out of shape. Going to 60 second rests especially on squats, cleans, or deads is very hard at first. But after a few weeks of it, you find all your strength is there as before and your in a heck of a lot better shape.