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Yes, you can even go as low as 20-30 seconds if your goal is not competitive powerlifting and more aesthetics, I wasted way too much time for inferior results before switching to short rest time

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Alternate working either opposing or totally unconnected muscle groups and there's no reason to rest any in between sets, which has the added benefit of turning it into a pretty incredible cardio workout at the same time.

Not entirely true. Once you're at a reasonable strength level simply switching muscle groups will not provide adequate rest for your CNS to perform your sets optimally.

Like I said above short rest times are not for powerlifting purposes but works perfectly in higher rep ranges.

This http://borgefagerli.com/myo-reps-in-english/ works very well for me, great results and very short workouts.

I usually have a rest between sets cause I'm tired :o

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