The keto diet is known to not be optimal for that level of physical performance. The body starts restoring glycogen levels from other substrates. Glucose is very important and your brain runs on glucose predominantly. There's some studies, even the Virta Health Study, that shows that like after six months, a year, 18 months, and then up to two years, glycogen levels in a ketogenic athlete are just as high as they are in a carb fueled athlete.