I've found I do best with scheduled stretching in between my heavy sets of 5/3/1, doing lower body stretches on upper body days, and vice versa. I've also started adding a complete day (easy day) of some stretching muscles while training the opposite muscle groups (reciprocal inhibition kind of idea).
I don't think doing the OLs or warm-ups are enough stretching in and of themselves...or else I wouldn't be stretching separately!
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