It's sad Speaks won't take his diet seriously.
There was a study done involving body fat and how it affected athletic performance:
In his next research, Dr. Todd tested 170lb athletes and loaded them with 3.4lb (or 2% body fat) vests and made them complete some power tests (vertical jumps, sprints)
Results:
For a 170 lb. athlete, a fat gain of 3.4 lbs. (2%) resulted in a vertical jump height loss of 2 inches (5 cms) , and a 40 yard sprint (37 meters) increase in time of 0.26 seconds.
https://www.bjjee.com/articles/scien...c-performance/
And that study was just 3.4 pounds. Imagine how much Speaks could improve if he added a little more muscle and shed 15 lbs of fat.