Waller, Michael, Tracey Robinson, Dustin Holman, and Matthew Gersick. 2016. “The Effects of Repeated Push Sled Sprints on Blood Lactate, Heart Rate Recovery and Sprint Times”. Journal of Sports Research 3 (1):1-9. https://doi.org/10.18488/journal.90/2016.3.1/90.1.1.9.