The data on whether static or dynamic stretching before exercise impacts performance is inconclusive.

“Again, the data are really split out there. There are even folks who suggest that doing any kind of stretching prior to running is going to lower running efficiency, it's going to require essentially more work and more oxygen uptake at a given speed for a variety of reasons, and runners and that community argue about this endlessly. There are papers in both sides, in both directions, I'm sure I'll hear about some of this in the comments. I'm not really going to take a stance on this as a consequence because the data are all over the place.”